In 1230, when his uncle, Ubaldo I Visconti, died, he invaded the giudicato of Cagliari to assure the continued influence of his Pisan family there.
Pada tahun 1230, ketika pamannya, Ubaldo I Visconti, wafat, ia menyerang giudicato di Cagliari untuk memastikan kelanjutan pengaruh keluarga Pisa disana.