Andria is a town in Italy not far from the Adriatic port of Barletta. 12 km from Andria is one of the greatest attractions of the South, the Castle on the Hill. It was built by order of Emperor Frederick II in 1229-1240. Everything in the Castle on the Hill is subject to the number eight: the building is octagonal, has an octagonal courtyard and eight towers, each of which has eight sides. The towers are two storeys high and there are eight rooms on each floor. The number eight is believed to represent the crown or the union between God and the emperor.