Saf ibn Sayyad
Saf ibn Sayyad (Arabic: الصف بن الصياد), later known as Abdullah ibn Sayyad (Arabic: عبد الله بن سعيد) or just Ibn Sayyad, was an alleged claimant of prophethood during the time of Islamic prophet Muhammad and his companions who later disappeared after the Ridda wars. Umar, a senior companion of Muhammad, and even some Islamic scholars today, speculate that he might be the Dajjal, who, according to Islamic beliefs, is the false Messiah and a major sign of the end of the world.