A corps built from a war tax
The Janissary corps traces to the fourteenth century, with a formation date of 28 June 1363 sometimes given, though the sources disagree on whether Sultan Orhan or his son Murad I was responsible for establishing it. The corps was funded initially through a one-fifth tax levied on slaves taken in war, a mechanism that tied the new infantry force’s existence directly to continued Ottoman military success rather than to any fixed state budget. It was conceived as an infantry force personally loyal to the sultan, distinct from the provincial cavalry that had traditionally supplied the bulk of Ottoman military manpower, and its creation marked an early and deliberate move toward a standing professional army rather than forces raised only for individual campaigns.
The child levy
From the 1380s until its abolition in 1648, the corps was chiefly filled through the devshirme, a periodic levy in which Ottoman officials searched provinces, especially in the Balkans, for the strongest sons of Christian families. Boys taken this way, drawn mainly from Albanian, Bosnian, Bulgarian, Serbian, and Greek communities, and later also from Armenian, Croatian, Hungarian, Romanian, and Ukrainian populations, underwent forced circumcision and conversion to Islam after removal from their families. Jewish boys were explicitly excluded from the system, and any suspected of concealment were reassigned as indentured labourers to the Imperial Arsenal. Recruits selected this way were placed with Ottoman Turkish families before formal training, a process meant to strip away their original language and identity ahead of military instruction.
Gunpowder infantry before most of Europe
The Janissaries were among the earliest infantry forces anywhere equipped primarily with firearms, an adoption associated with the reign of Murad II in the first half of the fifteenth century. By the early sixteenth century Janissary units carried muskets and later heavier weapons, and by 1605 the corps had developed a rotating system of volley fire that let musket-armed lines maintain continuous fire. Even so, in the classical period Janissaries made up only about a tenth of total Ottoman military strength, with provincial cavalry, the sipahis, still providing the bulk of the army. Corps numbers grew substantially over time regardless, from fewer than a thousand around 1400 to nearly 38,000 by 1609 and to some 135,000 by 1826, though later growth reflected looser recruitment rather than sustained battlefield need.
From celibate cadets to a hereditary caste
The corps’s original character eroded steadily from the late sixteenth century onward. In 1566 Sultan Selim II permitted Janissaries to marry, a change that weakened the isolation from ordinary society the institution had originally relied on to secure loyalty to the sultan alone. Rules against hereditary succession also broke down: the sons of serving Janissaries were increasingly enrolled directly, and by the mid-seventeenth century the devshirme levy had been largely abandoned in favour of recruiting free-born Muslims and soldiers’ own children, with some civilians reportedly purchasing membership for its social and economic privileges. Members increasingly took up trades and property ownership in violation of the corps’s founding restrictions, and by 1622 contemporary observers were describing the institution as a serious threat to imperial stability rather than a reliable guarantor of it.
A corps that could kill a sultan
As discipline loosened, the corps became a political actor in its own right, capable of removing rulers it judged to be against its interests. An early revolt in 1449 over pay was resolved in the Janissaries’ favour, but later confrontations turned violent: Sultan Osman II was killed by Janissaries in 1622 after attempting to disband the corps following a defeat in Poland, and a 1730 revolt led by Patrona Halil forced the abdication of Sultan Ahmed III and the execution of his grand vizier, at a cost estimated at several thousand casualties in the fighting that followed. A further revolt in 1807 deposed the reform-minded Sultan Selim III, whose creation of a modernised military force, the Nizam-i Cedid, was widely understood as a direct threat to Janissary privilege.
The Auspicious Incident
Sultan Mahmud II finally moved against the corps in 1826, having spent years consolidating his own position before acting. He announced the creation of a new, European-trained military force, and when the Janissaries responded with the expected mutiny and advanced on the palace, artillery fire set their barracks alight, killing an estimated four thousand men in what came to be called the Auspicious Incident. Survivors of the uprising were exiled or executed, their property confiscated, and Mahmud replaced the corps with a new army that had grown to some 27,000 troops by 1830. The episode ended an institution that had stood, in one form or another, for roughly four hundred and sixty years, and it is generally treated as a necessary but very late step in Ottoman military modernisation.