St. Gregory the Singer of Mt. Athos (1355)
Commemorated on October 1
He was a cantor at the Great Lavra on Mt Athos. Once, on the eve of Theophany, he was inspired to sing the hymn O full of grace, thou who art the joy of all creation instead of the usual It is truly meet to bless thee during the Divine Liturgy. When he did this, the most holy Theotokos appeared to him, thanked him and gave him a gold coin as a sign of her favor. The coin is still kept at the Lavra. He reposed in peace. St Gregory's hymn has been sung since that time as part of the Divine Liturgy of St Basil.