Saint Anastasius of Persia, also known by his native name Magundat, was a Zoroastrian soldier in the Sasanian army who later became a convert to Christianity and was martyred in 628.

[1] He was a soldier in the army of Khosrow II (r. 590–628) and participated in the capture of the True Cross in Jerusalem, which was carried to the Sasanian capital Ctesiphon.

There he interrupted and ridiculed the Zoroastrian priests for their religion, and was as a result arrested by the local marzban,[3] taken prisoner, cruelly tortured to make him abjure, and finally carried down near the Euphrates, to a place called Barsaloe (or Bethsaloe according to the Bollandists), where his tortures were continued while at the same time the highest honors in the service of King Khosrow II as a magus were promised him if he would renounce Christianity.

His body, which was thrown to the dogs but left untouched by them, was carried from the place of his martyrdom to Palestine, then to Constantinople, and finally to Rome where the relics were venerated at the Tre Fontane Abbey.

An adapted Latin translation, possibly by Archbishop Theodore of Canterbury, was available to the Anglo-Saxon church historian Bede, who criticized the result and took it upon himself to 'improve' it.