63-2 Al-Hakim Abu Ali Al-Husayn ibn Ahmad al-Bayhaqi narrated that Muhammad ibn Yahya al-Sowli quoted on the authority of Abu Thakwan that he had heard Ibrahim ibn Al-Abbas say, “The pledge of allegiance to Ar-Ridha’ occurred on the fifth day of the (Arabic) month of Ramadhan in the year 201 A.H. (815 A.D.). Al-Ma’mun married off his own younger daughter - Umm Habib - to Ar-Ridha’ at the beginning of the year 202 A.H. (816 A.D.). He died in Toos in the year 203 A.H. (817 A.D.), while Al-Ma’mun was going to Iraq in the (Arabic) month of Rajab.”And someone other than Al-Bayhaqi narrated that Ar-Ridha’ died when he was forty-nine and a half years old. The correct information is that he died in the year 203 A.H. (817 A.D.) on a Friday during the last ten days of the (Arabic) month of Ramadhan - nine days before the end of the month.