`Abdullah ibn `Umar was the son of the second Caliph `Umar ibn Al-Khattab and a brother-in-law and companion of Messenger of Allah. He was born in Makkah. He had accepted Islam before he was 10 years old and had made the Hijrah (migration to Madinah) with his father and his sister, Hafsah, who was later to become a wife of the Prophet.