Zaydism (الزَّيْدِيَّة) is a branch of Shia Islam that emerged in the eighth century following Zayd ibn Ali‘s unsuccessful rebellion against the Umayyad Caliphate. In contrast to other Shia Muslims of Twelver Shi'ism and Isma'ilism, Zaydis, also sometimes incorrectly called Fivers, consider Zayd to be the Imam to whom obedience is obligatory, due to him being a patrilinial descendent of Fatima and making the Call (Dawah) to jihad, two necessary qualities for an Imam of Obedience for the Zaydis. The Zaydi madhhab emerged in reverence of Zayd's failed uprising against the Umayyad Caliph, Hisham (r. 724–743 AD), which set a precedent for revolution against corrupt rulers. According to Hussein Badreddin al-Houthi, Zaydis find it difficult to "sit in their houses" and remain passive in an unjust world. Zaydis do not believe in the infallibility of Imāms and do not ascribe them with any supernatural qualities, but promote their leadership. They also reject the notion of nass imamate found in Twelver Shi'ism and Isma'ili Shi'ism. Zaydis believe that Zayd ibn Ali in his last hour was betrayed by the people in Kufa. Zaydis as of 2014 constitute roughly 0.5% of the world's Muslim population . In matters of Islamic jurisprudence, the Zaydis follow Zayd ibn ’Ali's teachings which are documented in his book Majmu’ Al-Fiqh (مجموع الفِقه). Zaydi fiqh is similar to the Hanafi school of Sunni Islamic jurisprudence, as well as the Ibadi school. Abu Hanifa, the founder of the Hanafi school, was favorable and even donated towards the Zaydi cause. Zaydis dismiss religious dissimulation (taqiyya). Zaydism does not rely heavily on hadith, but uses those that are consistent with the Qur'an, and is open to hadith. Some sources argue that Zaydism as simply a philosophy of political government that justifies the overthrow of unjust rulers and prioritizes those who are Banu Hashim. In matters of theology, the Zaydis are close to the Mu'tazili school, though they are not exactly Mu'tazilite.