Mustafa I (Ottoman Turkish: مصطفى اول, also transliterated as Mustafa; born 1601 or 1602 – died 20 January 1639) was the fifteenth sultan of the Ottoman Empire. He reigned twice, first from 22 November 1617 to 26 February 1618 and again from 20 May 1622 to 10 September 1623.
Early life
Mustafa was the son of Sultan Mehmed III and his consort Halime Sultan. Because Ottoman succession practiced fratricide, he survived his brothers’ deaths by being confined to the palace’s “Kafes” (cage), a secluded area where potential claimants were kept under guard. This prolonged isolation contributed to his reputation for mental instability.
First reign (1617–1618)
Following the death of his brother, Sultan Ahmed I, Mustafa was elevated to the throne on 22 November 1617. His rule was brief; the Janissary corps, dissatisfied with his perceived incapacity, deposed him on 26 February 1618 in favor of his nephew, Osman II.
Interregnum
After his removal, Mustafa was returned to confinement in the Kafes. During this period, he remained largely out of political affairs, though his existence continued to be a point of contention among court factions.
Second reign (1622–1623)
In May 1622, the Janissaries rebelled against Sultan Osman II, who had attempted to curb their power and had ordered the execution of several Janissary leaders. The Janissaries installed Mustafa as sultan on 20 May 1622. His second reign similarly suffered from questions regarding his mental fitness, and he was again deposed on 10 September 1623, after which his half‑brother Murad IV assumed the throne.
Later life and death
Following his second deposition, Mustafa was again placed under house arrest in the Kafes. He remained there until his death on 20 January 1639 in the Topkapı Palace, Istanbul.
Historical assessment
Historians note that Mustafa’s reigns were marked by the dominance of the Janissary corps and the influence of court officials, rather than by his own policy initiatives. Contemporary accounts describe him as having limited intellectual capacity, a condition often attributed to his long confinement from childhood. His periods on the throne illustrate the volatile nature of Ottoman succession in the early 17th century and the increasing power of military factions within the empire.