Al-Abbas ibn Abd al-Muttalib[a] (c. 566–653 CE) was a paternal uncle and sahabi (companion) of the Islamic prophet Muhammad, just three years older than his nephew.
A wealthy merchant, during the early years of Islam he protected Muhammad while he was in Mecca, but only became a convert after the Battle of Badr in 624 CE (2 AH).
[5] Within this role, he managed a caravan network to and from Syria, where he eventually recruited and trained Muhammad as an apprentice for leading the northern leg of the journey.
[8] Ibn Hisham said that Abbas had become a secret Muslim before the Battle of Badr;[9] but a clear statement to that effect is missing from Tabari's citation of the same source.
[29][30] The Abbasid dynasty founded in 750 by Abu al-ʻAbbās ʻAbdallāh as-Saffāh better known as As-Saffah claimed the title of caliph (literally "successor") through their descent from Abbas's son Abdallah.