Quite a fine king he was. A true philosopher-king. (1194-1250). From the wiki:
At the age of three, he was crowned King of Sicily as a co-ruler with his mother, Constance of Hauteville, the daughter of Roger II of Sicily. His other royal title was King of Jerusalem by virtue of marriage and his connection with the Sixth Crusade.
Frederick II (26 December 1194 – 13 December 1250), was one of the most powerful Holy Roman Emperors of the Middle Ages and head of the House of Hohenstaufen. His political and cultural ambitions, based in Sicily and stretching through Italy to Germany, and even to Jerusalem, were enormous. However, his enemies, especially the popes, prevailed, and his dynasty collapsed soon after his death. Historians have searched for superlatives to describe him, as in the case of Professor Donald Detwiler, who wrote:
A man of extraordinary culture, energy, and ability – called by a contemporary chronicler stupor mundi (the wonder of the world), by Nietzsche, the first European, and by many historians the first modern ruler – Frederick established in Sicily and southern Italy something very much like a modern, centrally governed kingdom with an efficient bureaucracy