A shekara ta 1248, ya auri Gertrud,'yar' uwar marigayi na karshe na namiji memba na Babenberg iyali, Duke Frederick II na Austria.
Tabbas, mafi rikitarwa na jumla shine "A cikin 1248, ya auri Gertrud, 'yar'uwar ɗan'uwan memba na ƙarshe na gidan Babenberg, Duke Frederick II na Austria kuma ya kawo Dukes na Austria da Styria a matsayin gadonta".