Saint Cosmas of Yakhrom was the servant of a certain nobleman, whom he comforted during his prolonged illness by reading him books. And so, travelling from city to city, they happened to stop at the River Yakhroma. Here in the woods an icon of the Dormition of the Most Holy Theotokos appeared to Cosmas, and he heard a voice commanding him to become a monk and to build a monastery. His sick master then received healing from the icon, and Cosmas went to Kiev, where he was tonsured in the Monastery of the Caves. Then with the icon of the Mother of God, and on an inspiration from above, he again went to Yakhrom, 40 versts from the city of Vladimir, constructing a temple in honor of the Dormition of the Most Holy Theotokos with the help of some good Christians.
Brethren began to gather around the monk, and a monastery was formed. Saint Cosmas was chosen as igumen. During this time, word of the monk’s ascetic struggles reached even the Great Prince. Saint Cosmas died at an advanced old age on February 18, 1492, and was buried in the monastery he founded. His memory is celebrated also on October 14, the day that the Yakhrom Icon of the Mother of God is commemorated.