Osman II
The Ottoman sultan Osman II (1618–22), who laid a siege on Khotyn (in modern Ukraine, then a part of Polish–Lithuanian Commonwealth), could not capture the city. He blamed the unruly jannissaries for the failure. The jannissaries, once elite troops of the Ottoman Empire, had been corrupted during the stagnation era of the empire. Osman planned to create a new army based on Turkmens of Anatolia. Energetic but young and inexperienced, Osman II revealed his intent. This caused a jannissary revolt in the capital Constantinople. Osman was imprisoned and later assassinated by the jannissary partizans on 20 May 1622. This assassination caused a great shock in the Ottoman lands.