The Castello Maniace in Syracuse, Sicily, Italy. This castle was constructed between 1232 and 1240 by the Emperor Frederick II, a launcher of the Sixth Crusade (1228-1229), in the quadrangular ‘Kastell’ shape, derived from the Roman ‘Castellum’. This shape was well known for the knightly orders during the Crusades, to name a few, Belvoir Castle built by the Knights Hospitaller in the Kingdom of Jerusalem (today’s Israel) in 1168, Cesis Castle built by the Livonian Order around 1237 in Livonia (today’s Latvia), and Gniew Castle built by the Teutonic Knights in the former Prussia (today’s Poland) after 1290.