Rumkale (Yavuzeli): The Greek castle, which is in the Kasaba village of Yavuzeli province of city of Gaziantep, is at the intersection point of Fırat River and Merzimen stream. It is thought that it is constructed in 840 B. C. during late Hittite period. It is told that one of the 12 disciples of Jesus Christ, Johannes (Yuhenna) had turned the Greek Castle into a center during Roman period, and maintained the spread of Christianity to Gaziantep environment. Rumour has it that the draft of the Bible of Yuhenna was kept in a secret room engraved to rock in the castle and then smuggled to Beirut.It is also told that cemetery of Yuhenna is within the castle and for this reason it is a holy place.