Dark Kingdom
The 2D hand-drawn animated show "Tangled" (later renamed "Rapunzel's Tangled Adventure") for its second and third seasons) began showing flashbacks set a quarter of a century ago in the Dark Kingdom, where the heavenly Moonstone resides within for hundreds of years in the second season's premiere "Beyond the Walls of Corona", "Rapunzel and the Great Tree" and the finale "Destinies Collide."