In 1206, William turned his sights on obtaining Gallura by force, but the giudicessa Elena married Lamberto Visconti, who rebuffed his assaults (1207).
Pada tahun 1206, Guglielmo berbalik mendapatkan Gallura secara paksa, namun giudicessa Elena menikahi Lamberto Visconti, yang menangkal serangannya (1207).