The Monastery of Saint Mamas (Greek: Ἅγιος Μάμας) was a monastery in the Byzantine capital, Constantinople, supposedly first founded in the 6th century, and surviving until the end of the 14th century.
The monastery was located in the southwestern part of the city, near the Xylokerkos Gate in the Theodosian Walls.
[1] Having fallen into decline, the monastery was restored in the late 10th century by Symeon the New Theologian, who served as its abbot for 25 years.
It was rescued by the mystikos George Kappadokes, who restored the monastery complex and secured its position via a chrysobull from Emperor Manuel I Komnenos (r. 1143–1180).
[1] In the course of this process, in 1158 the abbot Athanasios Philanthropenos composed a new charter (typikon) for the monastery, based on the model of Theotokos Euergetis Monastery.