Reference article: Facts about Armageddon, the ancient city otherwise known as Megiddo.
Megiddo is an archaeological site that was inhabited between roughly 7000 B.C. and 300 B.C. Numerous battles were fought near Megiddo during that time, and the Book of Revelation, which refers to the site as Armageddon, prophesied that a final battle at the end of time would take place there.
“Megiddo is mentioned a dozen times in the Hebrew Bible, and in a multitude of other ancient texts, but it is especially well-known as the setting in the New Testament for the penultimate battle between the forces of good and the forces of evil,” wrote Eric Cline, a professor of classical and Near Eastern languages and civilizations at George Washington University, in his book “Digging up Armageddon: The Search for the Lost City of Solomon” (Princeton University Press, 2020).
The name Armageddon comes from the Hebrew word “Har Megiddo,” which means the “mountain of Megiddo,” according to Cline. “By the Middle Ages, multiple nationalities, languages, and centuries had added an ‘n’ and dropped the ‘h’, transforming Har Megiddo to Harmageddon and thence to Armageddon,” Cline wrote.