The Christogram is the chosen symbol of the Pécs/Sopianae World Heritage Site. This first official symbol of Christianity can be seen in the Peter-Paul crypt. In 2000, during the excavation of Crypt V, archaeologists discovered the symbol as part of a bronze church lantern, assumed to be of Byzantine form and origin. The same symbol appeared to Emperor Constantine in a vision before the battle of Malvius bridge on 28 October 312 AD, accompanied by the words: “Win under this sign!"

On the example found in Pécs, in addition to the initial letters of Christ's name (X=khi, P=rho), the other two letters (A=alfa, w=omega) also refer to Christ.
“I am the alpha and the omega, the beginning and the end..." (The Book of Revelation, 21.6)