Serasker

Serasker, or seraskier (Ottoman Turkish: سرعسكر; Turkish pronunciation: [ˈseɾaskeɾ]), is a title formerly used in the Ottoman Empire for a vizier who commanded an army.

The latter now became a distinct office at the head of the Ottoman military, combining the functions of a commander-in-chief and a minister of war.

[1] He also took over the Janissary Agha's former duties regarding the upkeep of order in Istanbul.

Indeed, as the police system developed and expanded with the empire's progressive centralization, it became one of the main duties of the serasker until 1845, when policing became a separate agency.

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