Evtimiy of Tarnovo

Saint Euthymius of Tarnovo was Patriarch of Bulgaria between 1375 and 1393. Regarded as one of the most important figures of medieval Bulgaria, Euthymius was the last head of the Bulgarian Orthodox Church in the Second Bulgarian Empire. Arguably the best esteemed of all Bulgarian patriarchs, Euthymius was a supporter of hesychasm and an authoritative figure in the Eastern Orthodox world of the time.

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Source: Wikipedia