إن هذا العلم دين فانظروا عمن تأخذون دينكم - ابن سيرين
Indeed this knowledge is your religion, so carefully examine who you take religion from! - Ibn Sireen
Abdur Rahmaan ibnul Hassan ibn Muhammad ibn Abul Barakaat, Mas’ood al Baghdadee ad Damashqee al Hanbalee
'Abdur Rahmaan ibnul Hassan
736 H | 1335 C.E.
Died: 795 H | 1393 C.E
Ibnul Hijjee sated: ‘Ash Shaykh, al ‘Allaamah, al Haafidh, az Zaahid, Shaykh al Hanabilah.’
Ibn Hajar stated: ‘Al Muhaddith, al Haafidh, he was proficient in the sciences of Hadeeth; the biographies of narrators, the defects of Hadeeth, and the explanations of their wordings. He used to perform a lot of worship and night prayers.
As Suyootee stated: ‘He is the Imaam, the Haafidh, the Muhaddith, the Faqeeh…’
A more detailed biography of his can be found here
Amongst he books he authored:
Sarh ‘Ilal at Tirmidhee.
Fat-h al Baaree – an explanation of Saheeh al Bukharee
[other than ibn Hajar’s].