The Divan-ı Hümâyûn, in English the Imperial Council, was the de facto cabinet of the Ottoman Empire for most of its history. Initially an informal gathering of the senior ministers presided over by the Sultan in person, in the mid-15th century the Council's composition and function became firmly regulated. The Grand Vizier, who became the Sultan's deputy as the head of government, assumed the role of chairing the Council, which comprised also the other viziers, charged with military and political affairs, the two kadi'askers or military judges, the defterdars in charge of finances, the nişancı in charge of the palace scribal service, and later the Kapudan Pasha, the head of the Ottoman Navy, and occasionally the beylerbey of Rumelia and the Agha of the Janissaries. The Council met in a de