diff --git a/lib/class-wp-block-patterns-registry.php b/lib/class-wp-block-patterns-registry.php
index 9cf17eb375293..dedce3f9a3f19 100644
--- a/lib/class-wp-block-patterns-registry.php
+++ b/lib/class-wp-block-patterns-registry.php
@@ -138,44 +138,3 @@ function register_block_pattern( $pattern_name, $pattern_properties ) {
 function unregister_block_pattern( $pattern_name ) {
 	return WP_Block_Patterns_Registry::get_instance()->unregister( $pattern_name );
 }
-
-/**
- * Class used for interacting with patterns.
- */
-class WP_Patterns_Registry {
-
-	/**
-	 * Utility method to retrieve the main instance of the class.
-	 *
-	 * @return WP_Block_Patterns_Registry The main instance.
-	 */
-	public static function get_instance() {
-		_deprecated_function( 'WP_Patterns_Registry', 'Gutenberg 8.3.0', 'WP_Block_Patterns_Registry' );
-		return WP_Block_Patterns_Registry::get_instance();
-	}
-}
-
-/**
- * Registers a new pattern.
- *
- * @param string $pattern_name       Pattern name including namespace.
- * @param array  $pattern_properties Array containing the properties of the pattern.
- *
- * @return boolean True if the pattern was registered with success and false otherwise.
- */
-function register_pattern( $pattern_name, $pattern_properties ) {
-	_deprecated_function( __FUNCTION__, 'Gutenberg 8.1.0', 'register_block_pattern()' );
-	return register_block_pattern( $pattern_name, $pattern_properties );
-}
-
-/**
- * Unregisters a pattern.
- *
- * @param string $pattern_name       Pattern name including namespace.
- *
- * @return boolean True if the pattern was unregistered with success and false otherwise.
- */
-function unregister_pattern( $pattern_name ) {
-	_deprecated_function( __FUNCTION__, 'Gutenberg 8.1.0', 'unregister_block_pattern()' );
-	return unregister_block_pattern( $pattern_name );
-}
diff --git a/lib/compat.php b/lib/compat.php
index 9dd224adb2f19..36ca6a752a7bf 100644
--- a/lib/compat.php
+++ b/lib/compat.php
@@ -147,27 +147,6 @@ function gutenberg_add_dom_rect_polyfill( $scripts ) {
 }
 add_action( 'wp_default_scripts', 'gutenberg_add_dom_rect_polyfill', 20 );
 
-/**
- * Sets the current post for usage in template blocks.
- *
- * @return WP_Post|null The post if any, or null otherwise.
- */
-function gutenberg_get_post_from_context() {
-	// TODO: Without this temporary fix, an infinite loop can occur where
-	// posts with post content blocks render themselves recursively.
-	if ( is_admin() || defined( 'REST_REQUEST' ) ) {
-		return null;
-	}
-
-	_deprecated_function( __FUNCTION__, '8.1.0' );
-
-	if ( ! in_the_loop() ) {
-		rewind_posts();
-		the_post();
-	}
-	return get_post();
-}
-
 /**
  * Filters default block categories to substitute legacy category names with new
  * block categories.