Theodosius of Kiev
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Theodosius of Kiev is an 11th century saint who brought Cenobitic Monasticism to Kievan Rus' and, together with St Anthony of Kiev, founded the Kiev Pechersk Lavra (Kiev Monastery of the Caves). A biography of Theodosius was written in the twelfth century. His feast day is May 3.
Saint Theodosius' greatest achievement has been the introducing of the rule of Saint Theodorus Studita in the lavra and later in all of Rus. Today he is considered to be one of the first organizers of monasticism in the Russian Orthodox Church.