Serasker or Seraskier is a title formerly used in the Ottoman Empire

Ottoman Empire

The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

 for a Vizier

Vizier

A vizier or in Arabic script ; ; sometimes spelled vazir, vizir, vasir, wazir, vesir, or vezir) is a high-ranking political advisor or minister in a Muslim government....

 who commanded the army, and later for the National Minister of Defence.

A number of those closest to the Sultan were appointed Seraskier as either a sign of military ability or as a personal favour to those he deemed worthy of praise. The title was freely given and taken away.

List of Seraskers:

• Mehmed Namık Pasha
  Mehmed Namik Pasha
  Mushir Mehmed Emin Namık Pasha was a major Ottoman statesman of the nineteenth-century Ottoman Empire. He served under five sultans and acted as counsellor to at least four of them...
  
  

Serasker Risa Pasha