The Abbey of Saint-Étienne was founded by a descendant of who?
William the Conqueror William I (c. 1028 – 9 September 1087), usually known as William the Conqueror and sometimes William the Bastard, was the first Norman King of England, reigning from 1066 until his death in 1087. A descendant of Rollo, he was Duke of Normandy (as Duke William II) from 1035 onward. After a long struggle to establish his power, by 1060 his hold on Normandy was secure, and he launched the Norman conquest of England six years later. The rest of his life was marked by struggles to consolidate his hold over England and his continental lands and by difficulties with his eldest son.
Stephen II, Duke of Bavaria Duke Stephen II of Bavaria (1319 – 13 May 1375, Landshut) (German: "Stephan II. mit der Hafte, Herzog von Bayern"), after 1347 Duke of Bavaria. He was the second son of Emperor Louis IV the Bavarian by his first wife Beatrix of Świdnica and a member of the Wittelsbach dynasty.