Her maternal grandparents were Byzantine emperor Alexius III Angelus and Euphrosyne Doukaina Kamaterina .
Theodora Angelina was the only daughter of Anna Angelina and the sebastocrator Isaac Comnenus .
Theodora Angelina 's maternal grandparents were Byzantine emperor Alexius III Angelus and Euphrosyne Doukaina Kamaterina .
Theodora Angelina was the only daughter of Anna Angelina and the sebastocrator Isaac Comnenus .