Flavius Mar(cianus?)

Petrus Theodorus Valentinus Rusticius Boraides Germanus Iustinus, simply and commonly known as Justin (circa 525–566), is an East Roman (Byzantine) aristocrat and general.

A member of the Justinian Dynasty and nephew of Emperor Justinian I (r. 527–565), he is appointed as one of the last Roman consuls in 540, before going on to assume senior military commands in the Balkans and in Lazica.

He fights against the Slavs, the Sassanid Persians and supervises the Byzantine Empire's first contacts with the Avars.

At the time of Justinian's death, he is seen as a probable successor, but is beaten to the throne by his cousin, Justin II (r. 565–578), who exiles him to Egypt, where he is murdered.