Zayd ibn Ḥisn al-Ṭāʾī (), also referred to as Zayd ibn Ḥuṣayn al-Ṭāʾī al-Sinbisī (), (), was an Arab military commander during the First Fitna and a member of the Muhakkima, the Kufan dissidents who rejected the arbitration following the Battle of Siffin and are regarded in later historical tradition as a precursor movement to the Kharijites. Adam Gaiser, identifies him as one of the foundational martyrs of the Shurāt tradition.
A veteran of the Battle of Siffin, Zayd initially served in the army of Ali ibn Abi Talib before joining the secessionist faction that emerged after the arbitration with Mu'awiya I. Following the split, he was among those who became identified with the Muhakkima camp opposing both major factions of the civil war. During the Battle of Nahrawan (658 CE), he commanded the right wing of the Muhakkima forces under the overall leadership of Abd Allah ibn Wahb al-Rasibi.
Zayd was killed in action at Nahrawan. His death, alongside those of Ibn Wahb and Malik ibn al-Wadiyya, contributed to the emerging Shurāt tradition of viewing those killed in the struggle as martyrs, a concept that was later developed further under Abu Bilal Mirdas.
Early life and dissent in Kufa Zayd was a member of the Tayy tribe, belonging to the Banu Sinbis clan of the Al-Jadila branch. According to the 11th-century genealogist Ibn Hazm, his full paternal lineage is recorded as Zayd ibn Ḥiṣn ibn Wabara ibn Jarir ibn 'Amr ibn Hurmuz ibn Makhdab. He was among the Qurraʾ who expressed dissent in Kufa during the governorship of Sa'id ibn al-As. According to al-Tabari, a letter attributed to this group criticized the provincial administration and expressed their loyalty to the caliph, contingent on adherence to religious principles of governance. Al-Baladhuri lists Zayd ibn Hisn al-Ta'i alongside figures such as Hujr ibn Adi and Sulayman ibn Surad as members of the group responsible for drafting the letter to the caliph.
Battle of Siffin and arbitration
During the Battle of Siffin in 657 CE, Zayd was a prominent leader among the Kufan Quran reciters (qurrāʾ) in the army of Ali. When the Syrian forces of Mu'awiya I raised copies of the Quran on lances to call for a ceasefire and arbitration (taḥkīm), the plea initially split Ali's army. While Ali and others wished to continue fighting, Zayd and a faction of the qurrāʾ pressed him to accept the arbitration. According to reports transmitted by Abu Mikhnaf, Zayd and Mis'ar ibn Fadaki led the group that confronted Ali and demanded he respond to the "Book of God." Zayd personally threatened the Caliph, arguing that they had killed Uthman ibn Affan when he abandoned acting by the Book, and swore by God to do the same to Ali if he did not submit. Pushing this coercion further, Zayd also dictated the terms of the settlement itself. When Ali proposed Abd Allah ibn Abbas or Malik al-Ashtar to represent his side, Zayd and Al-Ash'ath aggressively rejected them, insisting instead on the appointment of Abu Musa al-Ash'ari under the assumption that he would serve as a neutral figure.
However, as the army marched back to Kufa, the mood among Zayd and his peers shifted dramatically. Influenced by the realization that arbitration circumvented divine command, citing Quranic principles such as , which mandates fighting rebellious factions until they return to obedience, they came to view the agreement as a grave sin. They argued that submitting leadership to mere men rather than God's judgment invalidated Ali's cause, and some may have feared accountability for their role in the revolution against Uthman. This regret turned into open reproach, giving rise to their defining slogan: "No judgment but God's!" When Ali refused to repent and cancel the treaty they had forced upon him, Zayd and his faction officially seceded from his command, forming the core of the early Muhakkima.
Battle of Nahrawan
Following the secession, the Muhakkima gathered at the house of Zayd ibn Hisn to determine their course of action. Although Zayd was offered overall leadership, he rejected it and instead supported the appointment of Abd Allah ibn Wahb al-Rasibi. During the gathering, Zayd delivered a sermon in which he justified armed revolt against Ali through the principles of commanding right and forbidding wrong and adherence to the Quran. Zayd concluded his address by urging the group to "strike their faces and sides with swords until the Most Compassionate and Merciful is obeyed," framing their potential death in the coming conflict as the ultimate path to God’s pleasure.
During the subsequent Battle of Nahrawan in 658 CE, Zayd commanded the right wing of the Muhakkima forces. He was killed in the battle, and his death, alongside that of other Muhakkima leaders, contributed to the later Shurāt tradition of viewing those killed in the struggle as martyrs. The term Shurāt, meaning "exchangers", derives from the Quranic description of believers who "exchange" their lives and property for Paradise. Modern scholarship notes that the term served as a positive self-designation for these early rebels, contrasting with the pejorative label Khawārij used by their opponents.
Legacy and family Zayd's family remained central to the Kharijite movement in Iraq long after his death at Nahrawan. His nephew, Mu'adh ibn Juwayn ibn Hisn (also recorded as Mu'adh ibn Juwayn ibn Husayn), was a veteran of Nahrawan who was among the four hundred wounded survivors found on the battlefield. Despite his role in the rebellion, Mu'adh was personally pardoned by Ali and carried off the field to recover.
However, during the governorship of al-Mughira ibn Shu'ba in Kufa (c. 661–671 CE), Mu'adh returned to militant activism. He emerged as one of the three primary leaders whom the Kufan Kharijites "turned to" for guidance, alongside al-Mustawrid ibn Ullafa and Hayyan ibn Zabyan. This group frequently met at the house of Hayyan to deliberate on the appointment of a new amir and to recall the "circumstances of their brethren" who fell alongside Zayd at Nahrawan. For these later seceders, the martyrdom of Zayd and his companions was used by later Kharijites to justify rejecting the Umayyad administration, viewing continued residence under their rule as "deceit and ruin" while striving (jihad) was seen as the only path to religious merit.
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