In 1248 , he married Gertrud , the niece of the last male member of the Babenberg famoly , Duke Frederick II of Austria and brought the Duchies of Austria and Styria as her heirloom .
In 1248 , he married Gertrud , the niece of the last male member of the Babenberg family , Duke Frederick II of Austria . 
 She brought the Duchies of Austria and Styria as her heirloom .