Abu-Dawud (full name Abu-Dawud Sulaiman bin Al-Aash'ath Al-Azdi as-Sijistani) was born in 202 A.H. and died in 275 A.H. He was one of the most widely travelled of the scholars of ahadith, going to Saudi Arabia, Iraq, Khurasahn, Egypt, Syria, Nishapur, Marv, and other places for the sole purpose of collecting ahadith.