Assertion: church's tradition | /r/HasProperty | introduced by two thessalonian brothers
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text: Church Slavonic represents a later stage of Old Church Slavonic, and is the continuation of the liturgical tradition introduced by two Thessalonian brothers, Saints Cyril and Methodius, in the late 9th century in Nitra, a principal town and religious and scholarly center of Great Moravia (located in present-day Slovakia).