The Auspicious Incident or Auspicious Event (Ottoman Turkish: وقعۀ خيريّه, romanized: Vak'a-i Hayriyye, lit. 'The Fortunate Event' in Constantinople; Vaka-i Şerriyye, "Event of Malignity" in the Balkans) was the forced disbandment of the centuries-old Janissary Corps by Ottoman Sultan Mahmud II on 15 June 1826. Most of the 135,000 Janissaries revolted against Mahmud II, and after the rebellion was suppressed, most of them were executed, exiled or imprisoned. The disbanded Janissary corps was replaced with a more modern military force.
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