Archaeologists in Israel have uncovered mosaics on the floor of a 1500 year old Byzantine church, including one that bears a Chi Rho symbol. The "Chi Rho" symbol puts together the first two letters in the Greek word for Christ, and looks like a P on top of an X. There is also an Alpha and Omega (first and last letters of the Greek alphabet) on either side of the Chi Rho, another Christian symbol, as Christ is described in Scripture as the the beginning and the end.
The Israel Antiquities Authority announced on Wednesday that the ruins were discovered during a salvage excavation ahead of a construction project in Aluma, a village about 30 miles south of Tel Aviv.
ht - live science