A.D. 350-353 Magnentius Bronze Bridgnorth Shropshire Hoard Coin, Chi-Rho Reverse

Called the first symbol of the Christian faith by the British Museum, the Christogram design merges the Greek letters X (Chi) and P (Rho). These are the first two Greek letters in Christ's name. First found on Constantine the Great's coinage, this symbol was used by his sons and later by Magnentius, who hoped to gather support for his campaign against Constantius II. From the Amiens Mint.