After the death of Isabella of England, Frederick's third wife, in 1241, he endowed Bianca with the castle of Monte Sant'Angelo, located in the cities of Vieste and Siponto.
Setelah kematian Isabella dari Inggris, istri ketiga Friedrich, pada tahun 1241, dia diberkahi Bianca dengan kastil Monte Sant'angelo terletak di kota-kota di Vieste dan Siponto.