Syriac Church of St. Mark

The Monastery of Saint Mark the Evangelist and the Virgin Mary is a Syriac Orthodox monastery in the Armenian Quarter of the Old City of Jerusalem and residence of the Syriac Orthodox Archbishop of Jerusalem. It is believed to be located on the site of house of Mary, mother of Mark the Evangelist; Syriac Christians believe that it was the place where the Last Supper was shared by Jesus and the Twelve Apostles, where the Apostles hid after the Passion and Crucifixion of Jesus, and where Jesus appeared to the Apostles after the Resurrection. The place claims to be the first church in Christianity. The monastery consists of the main church of Saint Mark and an adjacent chapel of Saint Behnam.

Source: Wikipedia