Abu Bakr ibn Hazm

Abu Bakr ibn Hazm was governor of Medina in the time of Umar ibn Abd al-Aziz. The caliph wrote to him asking him to collect the hadith of the Prophet and to write it down. ^{5 6}

Al-Salabi says that Umar wrote to him, while he was governor of Medina, to gather what there was of the hadith of the Messenger of God and of the living Sunna, and the hadith of Amra bint Abd al-Rahman, and to write it down, for fear that knowledge would be lost and its people would die. He ordered them to copy for him the Prophet's letter on the alms. ³

The book "History of the Umayyad State" says that the caliph wrote to the governors of the provinces to the same effect, and that this was in his caliphate (99–101 AH). ⁶

Al-Salabi says that he was governor of Medina and then its judge, that his stipend was three hundred dinars a month, and that he was the most knowledgeable of the people of his time about judgement. ⁴

What is not covered here: his full name and dates of birth and death. This needs an additional source.