The Castle of Trani is one of the most important fortified buildings erected by Emperor Frederick II of Svevia to protect his beloved Kingdom of Sicily;inherited by his mother;Norman princess Costanza of Altavilla.Its foundation;on a rocky bench of appreciably lowered level with respect to the land;and probably isolated from its origin;resulted in the destruction of a modest observation outpost;a small guard tower dating to the X - XI centuries;found under the plane Of the current entrance.An important building on the Puglia coast of the Federico Castello system;in the 13th century;the most modern in Europe;is located a short distance from the famous cathedral;strategically located in the center of a work;whose shallow backdrops would always have been an excellent natural defense;Both from the fury of the waves and from possible attacks on the northern front.On the model of the crusader castles of the Holy Land;in turn;the debtors of the Castra Romani;he had a simple and functional quadrangular structure;reinforced at the tops by four square towers of equal height;outer truss outline;an anthemuric wall of walking path;equipped with Freckles and merlot-that delimits three courtyards on the east;south and west faces;moistened water flooded by the sea.With the succession of the dynasties;first to the Angevins;then to the Aragonese;was always;to this day;of national relevance;except for a short period (1385-1419);when it was assigned to the captain of ventura Alberico da Barbiano;in grace Of the services rendered to Charles III of Durres in the struggle for succession with Luigi D'Angiò.Restored by the Superintendence for Environmental;Architectural;Artistic and Historical Heritage of Puglia since 1979;it was opened to the public on June 5;1998.