Frederick II, 1272–1337, king of Sicily (1296–1337), 3d son of Peter III of Aragón. When his brother, who was king of Sicily, became (1291) king of Aragón as James II, Frederick was his regent in Sicily. In 1295 James renounced Sicily in favor of the Angevin king of Naples, Charles II, but the Sicilians rebelled and crowned Frederick. A war ensued in which Frederick fought his own brother, now Charles's ally. In the Peace of Caltabellotta (1302) Charles and Pope Boniface VIII recognized Frederick as king of Trinacria (an ancient name for Sicily) for his lifetime. At his death the kingdom was to revert to the Angevin dynasty of Naples. Although Frederick married a daughter of Charles, war with Naples resumed in 1312. Frederick, allied successively with Holy Roman Emperors Henry VII and Louis IV, retook the title king of Sicily and, with his son Peter, was crowned in 1322. The war continued after Frederick's death.
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