John (nephew of Vitalian)

John (Latin: Ioannes, Greek: Ίωάννης, fl. 537–553), also known as John the Sanguinary, was the nephew of the rebel Vitalian and was an Eastern Roman general under Justinian I (r. 527–565), who was active in the Gothic War in Italy and against the Gepids in the western Balkans. He was married to Justina, the daughter of Justinian's cousin Germanus.