From the Prologue of Ochrid
Prince Michael of Chernigov went to the Tatar horde with his boyar Theodore, at the summons of Batu Khan. And because they refused, according to Tatar custom, to pass through fire and bow down before idols upon entering the presence of the khan, they were beheaded in the year 1244. Their relics, witnesses of their martyric death for Christ the Lord, rest in the Church of the Archangel in Moscow.

