Margraviate of Meissen
Gertrud's third husband was the Wettin scion Henry I of Eilenburg (d. 1103), Margrave of Margraviate of Meissen since 1089. Their son, Henry II was probably born after his death in 1103; Gertude acted as regent during his minority. She was one of the leaders of the insurrections against Emperor Henry IV and his son Henry V. She protected the interests of her sons and Margrave Henry II later secured the Wettin authority over Meissen.