The Katholikon (church) of the Serbian monastery of Chilandariou was built in the beginning of the 14th century. The outer narthex, here on the photo, is a later addition but if you look closer at the worn steps of the marble stairs you see that this has to be very old. How many pilgrims and monks has to cross this small staircase to damage the marble to this degree? So are these stairs from the 14th century? Who knows the answer?
The same steps in Chilandariou 2013 – photo by Wim Voogd