Churches before Constantine: http://www.theworldorbust.com/the-oldest-churches-in-the-world-lchaim/

That took me all of 30 seconds with an Internet search.

I did not "pontificate" about Jesus praying in Hebrew. I said "may" and "might."

Prescinding from what his divine knowledge meant in terms of languages, it is entirely reasonable to suppose he *might* have prayed in, or been conversant in, Hebrew, Aramaic, Greek and Latin. The Jewish Scriptures in his time existed both in Hebrew and in Greek; both were widely used in the Holy Land and the surrounding areas. Hebrew was not used in everyday conversation, but Greek was. Latin was not so common in the East, but it wasn't unknown. Someone engaged in business or a trade might well learn to deal in more than one language, based on who s/he does business with.

I was responding to the assertion that Jesus definitively did *not* use anything but Aramaic at the Last Supper. I don't believe anyone in AD 2017 can know such a thing.