In 1638 or 1648 the devshirme - based recruiting system of the Janissary corps formally came to an end .
In 1632 the Janissaries attempted an unsuccessful coup against Murad IV , who then imposed a loyalty oath on them .
In 1638 or 1648 the devshirme - based recruiting system of the Janissaries corps formally came to an end .
In 1632 the Janissaries attempted an unsuccessful coup against Murad IV , who then imposed a loyalty oath on them .