Background
He was born in Austrian Alland, the only son of Margrave Herman VI of Baden and Gertrude of Babenberg, niece and heiress of late Duke Frederick II of Austria.
He was born in Austrian Alland, the only son of Margrave Herman VI of Baden and Gertrude of Babenberg, niece and heiress of late Duke Frederick II of Austria.
As a fellow campaigner of Conradin of Hohenstaufen, he likewise was beheaded at Naples at the behest of Charles of Anjou. As Duke Frederick II of Austria had been killed at the 1246 Battle of the Leitha River, the ducal line of the Babenberg dynasty had become extinct. However, after the death of Emperor Frederick II, no strong Imperial authority existed to assert his title.
When Ottokar II married Gertrude"s aunt, Margaret of Babenberg and moved into Austria, he had to flee, at first to Styria and later to the Sponheim court in Carinthia.
From him Frederick expected support in enforcing his claims to power. In 1267 he made the fatal decision to accompany Conradin on his Italian expedition, after Charles of Anjou had been crowned King of Sicily by Pope Clement IV and killed Conradin"s uncle Manfred in the 1266 Battle of Benevento.
Conradin moved into Rome on 24 July 1268, but Charles defeated the Hohenstaufen troops at the Battle of Tagliacozzo on 23 August, whereafter Conradin and Frederick fled and passed into captivity on 8 September at Torre Astura, south of Anzio. Handed over by the Frangipani to Charles of Anjou, both remained in degrading imprisonment at the Castel dell"Ovo in Naples until publicly beheaded in the Piazza del Mercato on 29 October 1268.
Frederick"s and Conradin"s mortal remains were at first hastily buried, but later transferred to the church of Santa Maria del Carmine, at the behest of Conradin"s mother Elisabeth of Wittelsbach.