diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
index 53f8faa755..ab2fdce15b 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
@@ -726,6 +726,14 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 			$data['modified'] = mysql_to_rfc3339( $template->modified );
 		}
 
+		if ( rest_is_field_included( 'author_text', $fields ) ) {
+			$data['author_text'] = self::get_wp_templates_author_text_field( $template );
+		}
+
+		if ( rest_is_field_included( 'original_source', $fields ) ) {
+			$data['original_source'] = self::get_wp_templates_original_source_field( $template );
+		}
+
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data    = $this->add_additional_fields_to_object( $data, $request );
 		$data    = $this->filter_response_by_context( $data, $context );
@@ -748,6 +756,85 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 		return $response;
 	}
 
+	/**
+	 * Returns the source from where the template originally comes from.
+	 *
+	 * @access private
+	 * @internal
+	 *
+	 * @param WP_Block_Template $template_object Template instance.
+	 * @return string                            Original source of the template one of theme, plugin, site, or user.
+	 */
+	private static function get_wp_templates_original_source_field( $template_object ) {
+		if ( 'wp_template' === $template_object->type || 'wp_template_part' === $template_object->type ) {
+			// Added by theme.
+			// Template originally provided by a theme, but customized by a user.
+			// Templates originally didn't have the 'origin' field so identify
+			// older customized templates by checking for no origin and a 'theme'
+			// or 'custom' source.
+			if ( $template_object->has_theme_file &&
+			( 'theme' === $template_object->origin || (
+				empty( $template_object->origin ) && in_array(
+					$template_object->source,
+					array(
+						'theme',
+						'custom',
+					),
+					true
+				) )
+			)
+			) {
+				return 'theme';
+			}
+
+			// Added by plugin.
+			if ( $template_object->has_theme_file && 'plugin' === $template_object->origin ) {
+				return 'plugin';
+			}
+
+			// Added by site.
+			// Template was created from scratch, but has no author. Author support
+			// was only added to templates in WordPress 5.9. Fallback to showing the
+			// site logo and title.
+			if ( empty( $template_object->has_theme_file ) && 'custom' === $template_object->source && empty( $template_object->author ) ) {
+				return 'site';
+			}
+		}
+
+		// Added by user.
+		return 'user';
+	}
+
+	/**
+	 * Returns a human readable text for the author of the template.
+	 *
+	 * @access private
+	 * @internal
+	 *
+	 * @param WP_Block_Template $template_object Template instance.
+	 * @return string                            Human readable text for the author.
+	 */
+	private static function get_wp_templates_author_text_field( $template_object ) {
+		$original_source = self::get_wp_templates_original_source_field( $template_object );
+		switch ( $original_source ) {
+			case 'theme':
+				$theme_name = wp_get_theme( $template_object->theme )->get( 'Name' );
+				return empty( $theme_name ) ? $template_object->theme : $theme_name;
+			case 'plugin':
+				$plugins = get_plugins();
+				$plugin  = $plugins[ plugin_basename( sanitize_text_field( $template_object->theme . '.php' ) ) ];
+				return empty( $plugin['Name'] ) ? $template_object->theme : $plugin['Name'];
+			case 'site':
+				return get_bloginfo( 'name' );
+			case 'user':
+				$author = get_user_by( 'id', $template_object->author );
+				if ( ! $author ) {
+					return __( 'Unknown author' );
+				}
+				return $author->get( 'display_name' );
+		}
+	}
+
 
 	/**
 	 * Prepares links for the request.
@@ -861,13 +948,13 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 			'title'      => $this->post_type,
 			'type'       => 'object',
 			'properties' => array(
-				'id'             => array(
+				'id'              => array(
 					'description' => __( 'ID of template.' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'slug'           => array(
+				'slug'            => array(
 					'description' => __( 'Unique slug identifying the template.' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
@@ -875,29 +962,29 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 					'minLength'   => 1,
 					'pattern'     => '[a-zA-Z0-9_\%-]+',
 				),
-				'theme'          => array(
+				'theme'           => array(
 					'description' => __( 'Theme identifier for the template.' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 				),
-				'type'           => array(
+				'type'            => array(
 					'description' => __( 'Type of template.' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 				),
-				'source'         => array(
+				'source'          => array(
 					'description' => __( 'Source of template' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'origin'         => array(
+				'origin'          => array(
 					'description' => __( 'Source of a customized template' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'content'        => array(
+				'content'         => array(
 					'description' => __( 'Content of template.' ),
 					'type'        => array( 'object', 'string' ),
 					'default'     => '',
@@ -916,7 +1003,7 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 						),
 					),
 				),
-				'title'          => array(
+				'title'           => array(
 					'description' => __( 'Title of template.' ),
 					'type'        => array( 'object', 'string' ),
 					'default'     => '',
@@ -935,43 +1022,61 @@ class WP_REST_Templates_Controller extends WP_REST_Controller {
 						),
 					),
 				),
-				'description'    => array(
+				'description'     => array(
 					'description' => __( 'Description of template.' ),
 					'type'        => 'string',
 					'default'     => '',
 					'context'     => array( 'embed', 'view', 'edit' ),
 				),
-				'status'         => array(
+				'status'          => array(
 					'description' => __( 'Status of template.' ),
 					'type'        => 'string',
 					'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
 					'default'     => 'publish',
 					'context'     => array( 'embed', 'view', 'edit' ),
 				),
-				'wp_id'          => array(
+				'wp_id'           => array(
 					'description' => __( 'Post ID.' ),
 					'type'        => 'integer',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'has_theme_file' => array(
+				'has_theme_file'  => array(
 					'description' => __( 'Theme file exists.' ),
 					'type'        => 'bool',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'author'         => array(
+				'author'          => array(
 					'description' => __( 'The ID for the author of the template.' ),
 					'type'        => 'integer',
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
-				'modified'       => array(
+				'modified'        => array(
 					'description' => __( "The date the template was last modified, in the site's timezone." ),
 					'type'        => 'string',
 					'format'      => 'date-time',
 					'context'     => array( 'view', 'edit' ),
 					'readonly'    => true,
 				),
+				'author_text'     => array(
+					'type'        => 'string',
+					'description' => __( 'Human readable text for the author.' ),
+					'readonly'    => true,
+					'context'     => array( 'view', 'edit', 'embed' ),
+				),
+				'original_source' => array(
+					'description' => __( 'Where the template originally comes from e.g. \'theme\'' ),
+					'type'        => 'string',
+					'readonly'    => true,
+					'context'     => array( 'view', 'edit', 'embed' ),
+					'enum'        => array(
+						'theme',
+						'plugin',
+						'site',
+						'user',
+					),
+				),
 			),
 		);
 
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php b/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php
index 9452a18843..bb6824d679 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplateAutosavesController.php
@@ -310,7 +310,7 @@ class Tests_REST_wpRestTemplateAutosavesController extends WP_Test_REST_Controll
 
 		$properties = $data['schema']['properties'];
 
-		$this->assertCount( 16, $properties );
+		$this->assertCount( 18, $properties );
 		$this->assertArrayHasKey( 'id', $properties, 'ID key should exist in properties.' );
 		$this->assertArrayHasKey( 'slug', $properties, 'Slug key should exist in properties.' );
 		$this->assertArrayHasKey( 'theme', $properties, 'Theme key should exist in properties.' );
@@ -326,6 +326,8 @@ class Tests_REST_wpRestTemplateAutosavesController extends WP_Test_REST_Controll
 		$this->assertArrayHasKey( 'modified', $properties, 'modified key should exist in properties.' );
 		$this->assertArrayHasKey( 'is_custom', $properties, 'is_custom key should exist in properties.' );
 		$this->assertArrayHasKey( 'parent', $properties, 'Parent key should exist in properties.' );
+		$this->assertArrayHasKey( 'author_text', $properties, 'Parent key should exist in properties.' );
+		$this->assertArrayHasKey( 'original_source', $properties, 'Parent key should exist in properties.' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php b/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php
index fdd3570ebd..954e4977d3 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplateRevisionsController.php
@@ -449,7 +449,7 @@ class Tests_REST_wpRestTemplateRevisionsController extends WP_Test_REST_Controll
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 
-		$this->assertCount( 16, $properties );
+		$this->assertCount( 18, $properties );
 		$this->assertArrayHasKey( 'id', $properties, 'ID key should exist in properties.' );
 		$this->assertArrayHasKey( 'slug', $properties, 'Slug key should exist in properties.' );
 		$this->assertArrayHasKey( 'theme', $properties, 'Theme key should exist in properties.' );
@@ -465,6 +465,8 @@ class Tests_REST_wpRestTemplateRevisionsController extends WP_Test_REST_Controll
 		$this->assertArrayHasKey( 'modified', $properties, 'modified key should exist in properties.' );
 		$this->assertArrayHasKey( 'is_custom', $properties, 'is_custom key should exist in properties.' );
 		$this->assertArrayHasKey( 'parent', $properties, 'Parent key should exist in properties.' );
+		$this->assertArrayHasKey( 'author_text', $properties, 'Parent key should exist in properties.' );
+		$this->assertArrayHasKey( 'original_source', $properties, 'Parent key should exist in properties.' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplatesController.php b/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
index 266ca89a33..046f358ba3 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
@@ -102,23 +102,25 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 
 		$this->assertSame(
 			array(
-				'id'             => 'default//my_template',
-				'theme'          => 'default',
-				'slug'           => 'my_template',
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => 'Description of my template.',
-				'title'          => array(
+				'id'              => 'default//my_template',
+				'theme'           => 'default',
+				'slug'            => 'my_template',
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => 'Description of my template.',
+				'title'           => array(
 					'raw'      => 'My Template',
 					'rendered' => 'My Template',
 				),
-				'status'         => 'publish',
-				'wp_id'          => self::$post->ID,
-				'has_theme_file' => false,
-				'is_custom'      => true,
-				'author'         => 0,
-				'modified'       => mysql_to_rfc3339( self::$post->post_modified ),
+				'status'          => 'publish',
+				'wp_id'           => self::$post->ID,
+				'has_theme_file'  => false,
+				'is_custom'       => true,
+				'author'          => 0,
+				'modified'        => mysql_to_rfc3339( self::$post->post_modified ),
+				'author_text'     => 'Test Blog',
+				'original_source' => 'site',
 			),
 			$this->find_and_normalize_template_by_id( $data, 'default//my_template' )
 		);
@@ -147,23 +149,25 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 
 		$this->assertSame(
 			array(
-				'id'             => 'default//my_template',
-				'theme'          => 'default',
-				'slug'           => 'my_template',
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => 'Description of my template.',
-				'title'          => array(
+				'id'              => 'default//my_template',
+				'theme'           => 'default',
+				'slug'            => 'my_template',
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => 'Description of my template.',
+				'title'           => array(
 					'raw'      => 'My Template',
 					'rendered' => 'My Template',
 				),
-				'status'         => 'publish',
-				'wp_id'          => self::$post->ID,
-				'has_theme_file' => false,
-				'is_custom'      => true,
-				'author'         => 0,
-				'modified'       => mysql_to_rfc3339( self::$post->post_modified ),
+				'status'          => 'publish',
+				'wp_id'           => self::$post->ID,
+				'has_theme_file'  => false,
+				'is_custom'       => true,
+				'author'          => 0,
+				'modified'        => mysql_to_rfc3339( self::$post->post_modified ),
+				'author_text'     => 'Test Blog',
+				'original_source' => 'site',
 			),
 			$data
 		);
@@ -184,23 +188,25 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 
 		$this->assertSame(
 			array(
-				'id'             => 'default//my_template',
-				'theme'          => 'default',
-				'slug'           => 'my_template',
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => 'Description of my template.',
-				'title'          => array(
+				'id'              => 'default//my_template',
+				'theme'           => 'default',
+				'slug'            => 'my_template',
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => 'Description of my template.',
+				'title'           => array(
 					'raw'      => 'My Template',
 					'rendered' => 'My Template',
 				),
-				'status'         => 'publish',
-				'wp_id'          => self::$post->ID,
-				'has_theme_file' => false,
-				'is_custom'      => true,
-				'author'         => 0,
-				'modified'       => mysql_to_rfc3339( self::$post->post_modified ),
+				'status'          => 'publish',
+				'wp_id'           => self::$post->ID,
+				'has_theme_file'  => false,
+				'is_custom'       => true,
+				'author'          => 0,
+				'modified'        => mysql_to_rfc3339( self::$post->post_modified ),
+				'author_text'     => 'Test Blog',
+				'original_source' => 'site',
 			),
 			$data
 		);
@@ -241,26 +247,29 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		$data     = $response->get_data();
 		unset( $data['content'] );
 		unset( $data['_links'] );
+		$author_name = get_user_by( 'id', self::$admin_id )->get( 'display_name' );
 
 		$this->assertSameSetsWithIndex(
 			array(
-				'id'             => "{$theme_dir}//{$template}",
-				'theme'          => $theme_dir,
-				'slug'           => $template,
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => $args['post_excerpt'],
-				'title'          => array(
+				'id'              => "{$theme_dir}//{$template}",
+				'theme'           => $theme_dir,
+				'slug'            => $template,
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => $args['post_excerpt'],
+				'title'           => array(
 					'raw'      => $args['post_title'],
 					'rendered' => $args['post_title'],
 				),
-				'status'         => 'publish',
-				'wp_id'          => $post->ID,
-				'has_theme_file' => false,
-				'is_custom'      => true,
-				'author'         => self::$admin_id,
-				'modified'       => mysql_to_rfc3339( $post->post_modified ),
+				'status'          => 'publish',
+				'wp_id'           => $post->ID,
+				'has_theme_file'  => false,
+				'is_custom'       => true,
+				'author'          => self::$admin_id,
+				'modified'        => mysql_to_rfc3339( $post->post_modified ),
+				'author_text'     => $author_name,
+				'original_source' => 'user',
 			),
 			$data
 		);
@@ -421,27 +430,31 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		unset( $data['_links'] );
 		unset( $data['wp_id'] );
 
+		$author_name = get_user_by( 'id', self::$admin_id )->get( 'display_name' );
+
 		$this->assertSame(
 			array(
-				'id'             => 'default//my_custom_template',
-				'theme'          => 'default',
-				'content'        => array(
+				'id'              => 'default//my_custom_template',
+				'theme'           => 'default',
+				'content'         => array(
 					'raw' => 'Content',
 				),
-				'slug'           => 'my_custom_template',
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => 'Just a description',
-				'title'          => array(
+				'slug'            => 'my_custom_template',
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => 'Just a description',
+				'title'           => array(
 					'raw'      => 'My Template',
 					'rendered' => 'My Template',
 				),
-				'status'         => 'publish',
-				'has_theme_file' => false,
-				'is_custom'      => true,
-				'author'         => self::$admin_id,
-				'modified'       => mysql_to_rfc3339( $modified ),
+				'status'          => 'publish',
+				'has_theme_file'  => false,
+				'is_custom'       => true,
+				'author'          => self::$admin_id,
+				'modified'        => mysql_to_rfc3339( $modified ),
+				'author_text'     => $author_name,
+				'original_source' => 'user',
 			),
 			$data
 		);
@@ -469,27 +482,31 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		unset( $data['_links'] );
 		unset( $data['wp_id'] );
 
+		$author_name = get_user_by( 'id', self::$admin_id )->get( 'display_name' );
+
 		$this->assertSame(
 			array(
-				'id'             => 'default//404',
-				'theme'          => 'default',
-				'content'        => array(
+				'id'              => 'default//404',
+				'theme'           => 'default',
+				'content'         => array(
 					'raw' => '',
 				),
-				'slug'           => '404',
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => 'Template shown when no content is found.',
-				'title'          => array(
+				'slug'            => '404',
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => 'Template shown when no content is found.',
+				'title'           => array(
 					'raw'      => '404',
 					'rendered' => '404',
 				),
-				'status'         => 'publish',
-				'has_theme_file' => false,
-				'is_custom'      => false,
-				'author'         => self::$admin_id,
-				'modified'       => mysql_to_rfc3339( $modified ),
+				'status'          => 'publish',
+				'has_theme_file'  => false,
+				'is_custom'       => false,
+				'author'          => self::$admin_id,
+				'modified'        => mysql_to_rfc3339( $modified ),
+				'author_text'     => $author_name,
+				'original_source' => 'user',
 			),
 			$data
 		);
@@ -521,27 +538,31 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		unset( $data['_links'] );
 		unset( $data['wp_id'] );
 
+		$author_name = get_user_by( 'id', self::$admin_id )->get( 'display_name' );
+
 		$this->assertSame(
 			array(
-				'id'             => 'default//my_custom_template_raw',
-				'theme'          => 'default',
-				'content'        => array(
+				'id'              => 'default//my_custom_template_raw',
+				'theme'           => 'default',
+				'content'         => array(
 					'raw' => 'Content',
 				),
-				'slug'           => 'my_custom_template_raw',
-				'source'         => 'custom',
-				'origin'         => null,
-				'type'           => 'wp_template',
-				'description'    => 'Just a description',
-				'title'          => array(
+				'slug'            => 'my_custom_template_raw',
+				'source'          => 'custom',
+				'origin'          => null,
+				'type'            => 'wp_template',
+				'description'     => 'Just a description',
+				'title'           => array(
 					'raw'      => 'My Template',
 					'rendered' => 'My Template',
 				),
-				'status'         => 'publish',
-				'has_theme_file' => false,
-				'is_custom'      => true,
-				'author'         => self::$admin_id,
-				'modified'       => mysql_to_rfc3339( $modified ),
+				'status'          => 'publish',
+				'has_theme_file'  => false,
+				'is_custom'       => true,
+				'author'          => self::$admin_id,
+				'modified'        => mysql_to_rfc3339( $modified ),
+				'author_text'     => $author_name,
+				'original_source' => 'user',
 			),
 			$data
 		);
@@ -700,7 +721,7 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
-		$this->assertCount( 15, $properties );
+		$this->assertCount( 17, $properties );
 		$this->assertArrayHasKey( 'id', $properties );
 		$this->assertArrayHasKey( 'description', $properties );
 		$this->assertArrayHasKey( 'slug', $properties );
@@ -717,6 +738,8 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 		$this->assertArrayHasKey( 'is_custom', $properties );
 		$this->assertArrayHasKey( 'author', $properties );
 		$this->assertArrayHasKey( 'modified', $properties );
+		$this->assertArrayHasKey( 'author_text', $properties );
+		$this->assertArrayHasKey( 'original_source', $properties );
 	}
 
 	protected function find_and_normalize_template_by_id( $templates, $id ) {
@@ -747,10 +770,13 @@ class Tests_REST_WpRestTemplatesController extends WP_Test_REST_Controller_Testc
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/templates' );
 		$request->set_body_params( $body_params );
-		$response             = rest_get_server()->dispatch( $request );
-		$data                 = $response->get_data();
-		$modified             = get_post( $data['wp_id'] )->post_modified;
-		$expected['modified'] = mysql_to_rfc3339( $modified );
+		$response                    = rest_get_server()->dispatch( $request );
+		$data                        = $response->get_data();
+		$modified                    = get_post( $data['wp_id'] )->post_modified;
+		$expected['modified']        = mysql_to_rfc3339( $modified );
+		$expected['author_text']     = get_user_by( 'id', self::$admin_id )->get( 'display_name' );
+		$expected['original_source'] = 'user';
+
 		unset( $data['_links'] );
 		unset( $data['wp_id'] );