The Chronicle of Salimbene di Adam, and also Matthew of Paris claimed that a "confirmatio matrimonii in articulo mortis" ("marriage ceremony in the moments of death") took place between Bianca and Frederick when she was dying.
Babad Salimbene di Adam, dan juga Matius dari Paris menyatakan bahwa "confirmatio matrimonii di articulo mortis" ("upacara pernikahan pada saat-saat kematian") terjadi antara Bianca dan Friedrich ketika dia sedang sekarat.