Peter was a Roman usurper

Roman usurper

Usurpers are individuals or groups of individuals who obtain and maintain the power or rights of another by force and without legal authority. Usurpation was endemic during roman imperial era, especially from the crisis of the third century onwards, when political instability became the rule.The...

 of the early sixth century, recorded in two minor sources: the Consularia Caesaraugustana and the Victoris Tunnunnensis Chronicon

Victor of Tunnuna

Victor of Tunnuna was bishop of the North African town of Tunnuna and a chronicler from Late Antiquity....

. He was a "tyrant" (meaning usurper) against the Visigothic rulers of Spain. When the Visigoths captured the city of Dertosa in 506, he was arrested and executed, with his head being sent as a trophy to Saragossa. Nothing else is known about him, but he seems to be the second Roman governor (after Burdunellus

Burdunellus

Burdune'lus was a Roman usurper of the late fifth century, recorded only briefly in the Consularia Caesaraugustana...

) to try to usurp legitimate authority in the Ebro valley of Spain after the fall of the Western Roman Empire

Western Roman Empire

The Western Roman Empire was the western half of the Roman Empire after its division by Diocletian in 285; the other half of the Roman Empire was the Eastern Roman Empire, commonly referred to today as the Byzantine Empire....

.