Boris I(redirected from Boris I of Bulgaria)
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Died May 2, 907. Prince of Bulgaria from 852 to 889. He succeeded in strengthening the power of the prince. In 864 (865) he introduced Christianity in the Byzantine (orthodox) form. He strove to achieve independence for the church and, by maneuvering between Rome and Constantinople, brought about the institution of an archbishopric in Bulgaria in 879–880. In 886 he invited the pupils of Methodius—Clement, Nahum, and others—to Bulgaria. In 889 he handed over the throne to his son Vladimir and entered a monastery, assuming the name Mikhail.