A Duchy is a territory ruled by a duke or duchess. These duchies fall under power of the ruler of the country they are in. William the Coqueror was the Duke of the Duchy of Normandy
A "Duchie" refers to the joint of a cooking pot. Pass the Duchie. "Pass the Duchie" is a reggae song recorded by the British group Musical Youth from their 1982 album The Youth of Today.