São Jorge Castle is a historic castle in the Portuguese capital of Lisbon, located in the freguesia of Santa Maria Maior. Human occupation of the castle hill dates to at least the 8th century BC while the first fortifications built date from the 1st century BC. The hill on which São Jorge Castle stands has played an important part in the history of Lisbon, having served as the location of fortifications occupied successively by Phoenicians, Carthaginians, Romans, and Moors, before its conquest by the Portuguese in the 1147 Siege of Lisbon. Since the 12th century, the castle has variously served as a royal palace, a military barracks, home of the Torre do Tombo National Archive, and now as a national monument and museum.

More details: https://en.wikipedia.org/wiki/S%C3%A3o_Jorge_Castle