(1) He is Abu al-Qasim Umar ibn al-Husayn ibn Abdullah ibn Ahmad al-Kharqi, a Hanbali jurist who studied under his father, Abu Bakr al-Marwazi, and others. He emigrated from Baghdad to Damascus when wickedness increased there and the Companions (may Allah be pleased with them) were slandered. He died in 334 AH. References: Tabaqat al-Hanabila by Ibn Abi Ya‘la, vol. 2, pp. 75, 118; Wafayat al-A‘yan by Ibn Khallikan, vol. 3, p. 441; Shadharat al-Dhahab by Ibn al-‘Imad, vol. 2, p. 336. (2) The phrase “i.e. al-Kharqi, the father of Abu al-Qasim, the author of the Mukhtasar” is omitted in al-Siyar. The Mukhtasar is a compendium of jurisprudence in the school of Imam Ahmad, known as Mukhtasar al-Kharqi, comprising 2,300 legal issues. Despite Abu al-Qasim’s numerous works and legal annotations deposited in a house in Baghdad, that house burned after his departure, destroying his manuscripts before they could circulate. This Mukhtasar has appeared in several editions; the latest, edited by Zuhayr al-Shawish in 1403 AH, and has been explained by scholars such as al-Qadi Abu Ya‘la in two volumes and by Ibn Qudama al-Maqdisi (d. 620 AH), who titled his commentary Al-Mughni, a work of great value. References: al-Muntazam by Ibn al-Jawzi, vol. 6, p. 346; al-Bidaya wa’l-Nihaya by Ibn Kathir, vol. 11, pp. 240–241; Muqaddima al-Mukhtasar, ed. Zuhayr al-Shawish, pp. 7–10 (Introduction to Mukhtasar al-Kharqi by Shaykh Muhammad ibn Mani‘). (3) In the printed edition it reads: al-Marwazi. (4) The name Ishaq is omitted in al-Siyar. (5) In al-Siyar it reads “and another,” and the phrase “and a hadith scholar from the Qati‘ah of al-Rabi‘” is omitted. (6) It is attributed to al-Rabi‘ ibn Yunus, chamberlain (hajib) of al-Mansur. The Qati‘ah of al-Rabi‘ in al-Karkh comprised the villagers’ farms from a place called Bayawri. These two estates were among the iqta‘at granted by al-Mansur but later fell outside the grants of al-Mahdi. Merchants settled there until they acquired them as private property, to the exclusion of al-Rabi‘’s descendants. Reference: Mu‘jam al-Buldan by Yaqut al-Hamawi, vol. 4, p. 377.