Constans grew increasingly fearful that his younger brother, Theodosius, could oust him from the throne; he therefore obliged Theodosius to take holy orders and later had him killed in 660.
Konstans kemudian takut kalau adik lelakinya, Theodosius, melengserkan dirinya dari takhta; ia kemudian memerintahkan Theodosius untuk mengambil tugas suci dan membuatnya terbunuh pada 660.