The Room of the Last Supper – The Coenaculum. According to Christian tradition, already established during Byzantine times, Jesus and his disciples had their Passover Seder at this site on Mt. Zion during the last week of Jesus’ life. The place also served Jesus’ followers in their gatherings. A visit to the site today reveals a Romanesque Crusader structure with later renovations and the Muslim remains of a mosque. On the first floor is the traditional tomb of King David.