John of Damascus

John of Damascus, also called John Damascene, was an eighth-century Syrian Christian theologian, monk, priest, apologist, and hymnographer whose influence reaches across Eastern Christian theology and worship. His exact dates are uncertain: modern reference works place his birth in the later seventh century and his death in the mid-eighth century, while older sources give somewhat different dates. Much of the detailed narrative of his life comes from later biographies and must therefore be handled cautiously. He was associated first with Damascus and later with the monastery of Mar Saba near Jerusalem.

John became especially important during the iconoclastic controversies. His defenses of the veneration of icons argued that the incarnation of Christ changed the theological significance of sacred images. His major theological compilation, commonly called The Fount of Knowledge, brought together philosophical definitions, a survey of heresies, and an exposition of Christian doctrine. These writings helped make him one of the most influential Greek-speaking theologians of the early medieval period.

He is also closely associated with Byzantine hymnography. Canons for major feasts, including Easter material, have long circulated under his name, and his poetry joins biblical canticles with explicitly Christian interpretation. English-speaking churches know several of these texts chiefly through nineteenth-century translations by John Mason Neale, including The Day of Resurrection and Come, Ye Faithful, Raise the Strain. His legacy therefore unites doctrinal writing, defense of icons, biblical interpretation, and sung theology.