After the death of St Sergius in 1392, St Nikon (November 17) succeeded him as igumen. St Andrew became a novice in the monastery under St Nikon. Sometime before 1405 he moved to the Spaso-Andronikov Monastery founded by St Andronicus (June 13), with the blessing of St Nikon.There St Andrew received monastic tonsure and was taught iconography by Theophanes the Greek and the monk Daniel, St Andrew’s friend and fellow-ascetic.
St Andrew is first mentioned in the Chronicles in 1405, when he, Theophanes, and Prochorus painted the cathedral of the Annunciation. His next important project, which he undertook with the monk Daniel, was to paint the frescoes in the Dormition Cathedral in Vladimir in 1408.
St Nikon of Radonezh asked St Andrew and Daniel to paint the new church in the reconstructed monastery of the Holy Trinity, which had been destroyed by the Tatars in 1408. At this time St Andrew painted his most famous icon: the Holy Trinity (actually, the Hospitality of Abraham).
St Andrew fell asleep in the Lord between 1427-1430, and was buried in the Andronikov Monastery. He was over seventy years old at the time of his death. The monk Daniel, who died before St Andrew, appeared to his friend and urged him to join him in eternal blessedness.
Troparion — Tone 3
Shining with the rays of divine light, / O venerable Andrew, / You knew Christ the wisdom and power of God. / By means of the image of the Holy Trinity / You preached to all the world the Holy Trinity in unity. / And we, with amazement and joy, cry out to you: / As you have boldness before the Most Holy Trinity / Pray that the Uncreated Light / May illumine our souls!
Kontakion — Tone 2
Like a trumpet, you clearly sounded the sweetness of divine hymns, / and were revealed as a brilliant beacon shining on the world with the light of the Trinity. / Therefore, we all cry to you, venerable Andrew: / “Unceasingly pray for us all.”