The Abbasid Caliphate executed 42 Byzantine officials who had been captured in the sack of Amorium of 838 for refusing to convert to Islam. 42 Martyrs of Amorium: The 42 Martyrs of Amorium were a group of Byzantine senior officials taken prisoner by the Abbasid Caliphate in the Sack of Amorium in 838 and executed in 845, after they refused to convert to Islam. They are commemorated by the Roman Catholic Church and the Eastern Orthodox Church on March 6. Amorium is located at Hisar, Turkey. March 6, 845. Wiki link