Giselbert supported Henry I who rewarded him with his daughter Gerberga in marriage and with the title, Duke of Lorraine (928). In 939 Giselbert revolted against Henry I's son, Otto I the Great and was killed in defeat near Andernach - Otto I thereupon was recognized by Louis IV as Duke of Lorraine and Louis IV married Gerberga. Giselbert was lay abbot of Echternach, 915-39.

References: [RFC],[WallopFH],[AR7],[Moncreiffe]