Following Muhammad's death in 632, several Arab tribes rebelled against his Rashidun successor, Caliph Abu Bakr, switching their allegiance to Tulayha of the Banu Asad. The Tayy's allegiance during the ensuing Ridda Wars is a "widely disputed matter", according to historian Ella Landau-Tasseron. Some Muslim traditions claim all of the Tayy remained committed to Islam, while Sayf ibn Umar's tradition holds they all defected. Landau-Tasseron asserts that neither extreme is correct, with some Tayy leaders, foremost among them Adi ibn Hatim, fighting on the Muslim side and others joining the rebels. However, Tayyid rebels did not engage in direct conflict with the Muslims.