Hey all. I ran across this really interesting article on St. Gregory Palamas (Archbishop of Thessaloniki, Greece in the 14th c.) during his captivity by the Ottoman Turks. He was known to have engaged in some amazing apologetics work during his imprisonment, attempting to convince his captors of the truth of the Christian faith.
Thought you all might get something out of it.
Facing Islam Blog: St. Gregory Palamas - Confessor and Defender of Orthodoxy Against Islam