pursued his advantage and was duly elected king in Cologne a few weeks later. The young son of the late king was given the Duchy of Swabia. Conrad left no male heirs by his first wife, Gertrude von Komburg. In 1136, he married Gertrude of Sulzbach, who was a daughter of Berengar II of Sulzbach, and whose sister Bertha was married to Emperor Manuel. Gertrude was the mother of Conrad's children and the link which cemented his alliance with Byzantium. See also Kings of Germany family tree References Sources Baldwin, M. W. A History of the Crusades: the first hundred years, 1969. Bernhardi, Wilhelm (1883). Konrad III: Jahrbücher der Deutschen Geschichte. Leipzig: Duncker & Humblot. Ziegler, W. König Konrad III. (1138–1152). Hof, Urkunden und Politik (= Forschungen zur Kaiser- und Papstgeschichte des Mittelalters. Band 26) Böhlau, Wien u. a. 2008 1090s births 1152 deaths Year of birth uncertain 12th-century Kings of the Romans People from Bamberg Hohenstaufen Christians of the Second Crusade Burials at Bamberg Cathedral Dukes of Franconia Anti-kings 12th-century people of the Holy Roman Empire