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The diocesan structure of the Ruthenian Church on the Grand Duchy of Lithuania lands began its formation at the end of the 11th century. The Smolensk bishopric was separated from Pereeslav diocese in 1136 as a result of Smolensk prince Rostsislav Mstsislavovich's (1127-1159) efforts. The Smolensk bishopric covered Smolensk Duchy as well as Mstsislav land. The oldest information concerning the existence...
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