Theotokos Church

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Theotokos Church is the name of Orthodox churches and monasteries. “Theotokos” means bearer of God and is an epithet of Mary, which was given to her at the Council of Ephesus in 431.

Churches in Constantinople
The Theotokos was the patron saint of Constantinople. Therefore, churches in Constantinople were named after her, including:

Church of the Theotokos in Blachernenviertel (Baltic district), built in the middle of the 5th century, which housed the mantle of the Blessed Mother. This coat has been worn since the 9th century in a procession around the city when enemy attacks were feared.
Church of Theotokos Chalkoprateia, founded in the early 5th century, in which the belt of the Blessed Virgin was preserved
Church of Panagia Eleousa of Pantokrator Monastery
Monastery of Panaghia Hodegetria (Hodegon Monastery)
Church of Theotokos Pammakaristos
Church of Theotokos Pege (source), built around 500 at a sacred source
Church of Theotokos at Pemptos Gate
Church of the Theotokos from the lighthouse (Θεοτόκος τοῦ Φάρου, Theotokos tou Pharou)

See also:
Panagia Theotokos, churches in Cyprus
Kimisis tis Theotokou (Gastouni)
Kimisis tis Theotokou (Kondariotissa)
Kimisis tis Theotokou (Lygourio)
Kimisis tis Theotokou (Neo Ireo)

Marienkirche