Malta – Auberge de Castille – €10 – 2008 – Proof – Wood Box and COA – The Auberge de Castille was the official seat of the knights of the Langue of Castille, Leon and Portugal – one of the most powerful of the Order, its Head being the Grand Chancellor. The famous building is situated at the highest point of Valletta. The original Auberge was built in 1574. It became the Office of the Prime Minister in 1972.