A confessor under Ottoman rule
Nicholas belonged to the company of the New Martyrs, Orthodox Christians who suffered for the faith under Ottoman rule in the centuries after the fall of Constantinople. The pressure on the Christian population of Sofia to accept Islam forms the background of his confession, and his steadfast refusal to apostatize is the heart of his commemoration.
The accounts differ on the immediate circumstances of his death. The Slavic synaxarion preserved in the Orthodox Church in America's collection relates that he was stoned outside the city at a place called the "Three Wells" and that his body was afterward burned. A briefer notice records that he was brought before a Muslim judge, freed, and then killed by a mob of townspeople. The anchor record for this database follows the tradition that he was stoned and burned in 1555.