Khattab ibn Nufayl was an Arab from the tribe of Quraish. He lived during the 6th century and was a contemporary of Muhammad. He was also the father of Umar ibn al-Khattab, who would later become Muslim and is regarded by Sunni Muslims as the second "Rightly guided Caliph" (Arabic "Rashidun"). Thus, he was an ancestor of Sahaba.
One time, his nephew Said ibn Zayd taunted him for worshiping idols. At that, he seethed with anger and strode up to Zayd, slapped him on the face and shouted:
He had a son, Umar, who would accompany him in persecuting the Muslims. His other children included a daughter, Fatimah bint al-Khattab,and a son Zayd ibn al-Khattab. The daughter married the hanif Said ibn Zayd, and later would both become Muslims. However, they hid their new faith from Khattab and Umar due to fear of persecution. Eventually, Umar discovered their faith, and Umar became a Muslim that very day.
^ 1) Al Maarif, by Ibn Qutaybah page 77, Chapter "Dhikr Umar" [1]