Norwich Castle is a medieval royal fortification in the city of Norwich, in the English county of Norfolk. It was founded in the aftermath of the Norman conquest of England when William the Conqueror ordered its construction because he wished to have a fortified place in the important city of Norwich. It proved to be his only castle in East Anglia. It is one of the Norwich 12 heritage sites. In 1894 the 'Norwich Museum' moved to Norwich Castle and it has been a museum ever since. It is now known as Norwich Castle Museum & Art Gallery, and holds significant objects from the region, especially archaeological finds and natural history specimens.