Overview
Frederick of Antioch (c. 1223 – 1255/6) was an Italian nobleman who served as the imperial vicar of Tuscany from 1246 to 1250. He was an illegitimate son of Frederick II, Holy Roman Emperor, by an unidentified southern Italian noblewoman. He took part in the wars of the Guelphs and Ghibellines in northern Italy, and in the war over the Kingdom of Sicily following his father's death (1250).
Biography
Early life
Frederick was the illegitimate son of the Emperor Frederick II and a certain Matilda (Maria) of Antioch, daughter of Robert of Antioch. Contemporary anti-imperial propaganda alleged that Frederick was the product of the emperor's liaison with a Muslim woman in Palestine, but it is almost certain that the child was born in southern Italy, where he spent his youth. The claim that he was a son of Plaisance of Antioch, daughter of the reigning Prince Bohemond V, is unfounded, as is the later claim that his mother's name was Beatrice (Beatrix). Like most of his father's illegitimate children, Frederick was probably born during the period when his father was unmarried (1222–24). At least one illegitimate half-brother of Frederick's shared his name, Frederick of Pettorano, born about eleven years earlier.
Between 1236 and 1245, Frederick married Margherita Conti di Poli. As their eldest son, Conrad, was married to Beatrice Lancia in 1258, it is probable that he was born around 1240 and that his parents' marriage pre-dates that. Margherita was the daughter of a Roman nobleman, Giovanni Conti, lord of Poli and at various times a senator of Rome. Besides Poli, he held allodial and feudal land at Anticoli Corrado, Arsoli, Camerata Nuova, Guadagnolo, Roviano and Saracinesco. Giovanni was among Frederick II's followers in Rome in 1229–30, and was rewarded with the county of Albe, which was nearer his other properties, in exchange for that of Fondi. Through his marriage Frederick came to possess important castles and rights along the Via Valeria, an ancient route connecting the Kingdom of Sicily and the Papal States.
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