Al-Abbas ibn Abd al-Muttalib (Arabic: ٱلْعَبَّاسُ ٱبْنُ عَبْدِ ٱلْمُطَّلِبِ, romanized: al-ʿAbbās ibn ʿAbd al-Muṭṭalib; c. 568 – c. 653CE) was paternal uncle and Sahabi (companion) of 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). His descendants founded the Abbasid Caliphate in 750.
During the early years, while the Muslim religion was gaining adherents (610-622), Abbas provided protection to his kinsman but did not adopt the faith. He acted as a spokesman at the Second Pledge of Aqaba, but he was not among those who emigrated to Medina.
Having fought on the side of the polytheists, Abbas was captured during the Battle of Badr. Muhammad allowed al-Abbas to ransom himself and his nephew.
Ibn Hisham says that Abbas had become a secret Muslim before the Battle of Badr; but the clear statement is missing from Tabari's citation of the same source. It is sometimes said that he converted to Islam shortly after Badr.
It is elsewhere implied that Abbas did not formally profess Islam until January 630, just before the fall of Mecca, twenty years after his wife Lubaba converted. Muhammad then named him "last of the migrants" (Muhajirun), which entitled him to the proceeds of the spoils of the war. He was given the right to provide Zamzam water to pilgrims, which right was passed down to his descendants.
Abbas immediately joined Muhammad's army, participating in the Conquest of Mecca, the Battle of Hunayn and the Siege of Ta'if. He defended Muhammad at Hunayn when other warriors deserted him. After these military exploits, Abbas brought his family to live in Medina, where Muhammad frequently visited them and even proposed marriage to his daughter.