Abu Dawud
Abu Dawud, was a Persian scholar of hadith. He was born in Sistan, eastern Iran (then Persia) and died in 889 in Basra.  He collected Sunan Abu Dawud, one of the Kutub al-Sittah (six major hadith collections). Imam Abu Dawud was a follower of Hanbali while some consider him Shafi. He wrote some 21 books in total. His major works include: