The Metropolis of Derkoi (Greek: Ἱερὰ Μητρόπολις Δέρκων) is a residential see of the Eastern Orthodox Church subject to the Ecumenical Patriarch of Constantinople and situated in the Istanbul suburb of Yesilköy (historically San Stefano).
The village of Derkos/Derkoi (modern Durusu or Terkos) is attested since Classical Antiquity, but Emperor Anastasius I (r. 491–518) raised it to the status of a city and rebuilt it as a forward stronghold for the defence of Constantinople.
Probably at the same time it was created as an episcopal see ("Bishopric of Derkoi and Chele", Επισκοπή Δέρκων και Χηλής).
[1] The anonymous archbishop of Derkoi co-signed the Acts of Union with the Catholic Church in July 1274.
Archbishop Gabriel is attested as a signatory of the tomos of 1351, endorsing the views of Gregory Palamas and ending the Hesychast controversy.
The last metropolitan before the Fall of Constantinople was Acacius, mentioned in late 1452, shortly before the town itself was captured by the Ottomans.
[1] Under Ottoman rule it was a little village south-west of Karaburun, a promontory on the Black Sea, and on the southern bank of Lake Derkos, the waters of which are brought to Constantinople by an aqueduct.
In 1466, it was ruled directly by the Patriarch of Constantinople [Kambouroglou, Monuments for History of Athens (Gr.
[citation needed] In October 1746, it was raised to the eighth rank of the Greek hierarchy (Mansi, Col.