15. Massive stone arch

A massive stone arch stretches across the porch, bearing an engraved cross with extended arms on one side and the monogram of Christ on the other. Next to the letters ‘X’ and ‘P’, an abbreviation of Hristos, there is an engraved ‘omega’ as the last letter of the alphabet, and a stylized wreath encircles the whole. Scientists interpret this rebus as saying: 'We celebrate (the wreath) Christ (monogram) who was crucified and who will pass judgment at the end of the world (omega)'. The remnants of the stairway, which connected the ground and the first floors, are visible to the west of the porch.