ʿAbd Allāh ibn Sabāʾ al-Ḥimyarī () (sometimes also called Ibn Sabāʾ, Ibn al-Sawdāʾ, or Ibn Wahb,) was a 7th-century figure in Islamic history associated with a group of followers called the Sabaʾiyya (). According to Sunni and Shia tradition, Abd Allah ibn Saba' was a Yemenite Jew from the Arab Himyar tribe who converted to Islam during Uthman's reign. Because of his exaggerated reverence for Ali, he is traditionally considered as the first of the ghulāt. In accounts collected by Sayf ibn Umar, Ibn Saba' and his followers (the Saba'iyya) are said to be the ones who enticed the Egyptians against Uthman and were responsible for breaking the near-settlement at the Battle of the Camel. Modern historians differed on the historicity of Ibn Saba'. Some believe that Abd Allah ibn Saba' and Ibn al-Sawdāʾ should be considered as two separate individuals (Hodgson). Some have described him as semi-legendary or legendary (Taha Hussein, Bernard Lewis, Wilferd Madelung, Leone Caetani, and Shia historians) Others such as Israel Friedlander, Sabatino Moscati, and Sunni historians affirm his existence. His Jewish origin has also been contested. Some modern historians assert that Sayf ibn Umar fabricated the episode about the killing of Uthman to "exonerate the people of Medina from participation in the caliph's murder" and the movement to support Ali as a successor to Muhammad did not exist in the time of Uthman. With the exception of Taha Hussein, most modern Sunni writers affirm the existence of Ibn Saba'. Historicity According to traditional Sunni and Shia sources, Abd Allah ibn Saba' was a Yemenite Jewish convert to Islam. But modern historians differed on the historicity of Ibn Saba. M.G.S. Hodgson doubts that Ibn Saba' was a Jew, and suggests that Ibn Saba' and Ibn al-Sawada' should be considered as two separate individuals.<ref>Robert L. Canfield, Turko-Persia in Historical Perspective, Cambridge University Press, 2002, Page 159, </ref> According to Leone Caetani, Ibn Saba in origin was a purely political supporter of Ali, "around whom later generations imagined a religious conspiracy like that of the Abbasids". Taha Hussein and Ali al-Wardi maintain that Ibn Saba' was the creation of Umayyad propaganda. However, some historians affirm the existence of Ibn Saba' or his followers. Israel Friedlander concludes that Ibn Saba' and the Saba'iyya did, in fact, exist. His work has also been attested to by Sabatino Moscati. Linda D. Lau and A. R. Armush also accept Sayf ibn Umar's