John of Damascus, a monk in Mar Saba near Jerusalem, wrote the Fount of Knowledge, a comprehensive systematic theology that synthesized Greek patristic thought and defended icons against Iconoclasts. He also composed hymns and canons that shaped Byzantine liturgical poetry. John's work became a standard reference for Eastern Orthodox theology and was influential in the West through Latin translations.

John of Damascus's hymns, including his Easter canon and the 'Theotokos' hymns, are among the masterpieces of Byzantine liturgical poetry, influencing the development of Greek and Slavic religious verse. His defense of icons as vehicles of theological meaning shaped the relationship between Christian poetry and visual art in the Eastern tradition.