Porphyrius
Martyrological notice
The historical Roman Martyrology commemorates Porphyrius on 15 September. The source places the commemoration at Item.
Historical martyrology witness · Martyrologium Romanum (Latin historical edition)
Item sancti Porphyrii mimi, qui, coram Juliano Apostata, per jocum suscipiens baptismum, Dei virtute derepente mutatur, et Christianum se esse profitetur; ac mox, ipsius Imperatoris mandato securi percussus, martyrio coronatur.