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The Old Calendar Orthodox Church of Bulgaria is an Orthodox Church which follows the traditional Orthodox liturgical calendar, or Julian Calendar. At the request of the Old Calendar Orthodox in Bulgaria, the Orthodox Church of Greece (Holy Synod in Resistance) founded the Diocese of Triaditza and subsequently released it to be an independent body. The Diocese of Triaditza is administered by Bishop Photii. His cathedral church is the Cathedral of the Dormition of the Theotokos in the Buxton district of the Bulgarian capital Sofia. This Church stands in resistance to modernism and ecumenism in the Local Orthodox Churches. She especially cherishes the memory of St. Seraphim (Sobolev) of Sofia. The Old Calendar Orthodox Church of Bulgaria is in full communion with the Old Calendar Orthodox Church of Romania and the Greece.
- Official Website
- Torna a Chiese Ortodosse (in Italian)
- Administration-Old Calendar Orthodox Church of Bulgaria
-  in Bulgarian, Russian
bg:Българска старостилна православна църква ru:Болгарская старостильная церковь