Leopold IV. Babenberg von Österreich, Duke of Bavaria, Margrave of Austria, was born circa 1108 to Luitpold III. von Österreich (1073-1136) and Agnes of the Holy Roman Empire (c1072-1143) and died 18 October 1141 Niederaltaich of unspecified causes. He married Maria of Bohemia (c1124-aft1160) 28 September 1138 JL . Charlemagne (747-814), Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.