Israeli archaeologists said Saturday they have discovered what may be the oldest Christian church in the Holy Land on the grounds of a prison near the biblical site of Armageddon.

The Israeli Antiquities Authority said the ruins are believed to date back to the third or fourth centuries and include references to Jesus and images of fish, an ancient Christian symbol.

"This is a very ancient structure, maybe the oldest in our area," said Yotam Tepper, the head archaeologist on the dig.

The dig took place over the past 18 months at the Megiddo prison in Israel's northern Galilee region, with the most significant discoveries taking place in the past two weeks, Tepper said. Scholars believe Megiddo to be the New Testament's Armageddon, the site of a final war between good and evil.