The Bulgarian Exarchate is established by decree of Sultan Abdülaziz of the Ottoman Empire.

Abdulaziz (Ottoman Turkish: , romanized: Abd'l Azz Turkish: I. Abdlaziz; 8 February 1830 4 June 1876) was the 32nd Sultan of the Ottoman Empire and reigned from 25 June 1861 up until 30 May 1876, where he was overthrown via a government coup. He was the son of Sultan Mahmud II and succeeded his brother Abdulmejid I in 1861.Born at Eyp Palace, Constantinople (present-day Istanbul), on 8 February 1830, Abdulaziz received an Ottoman education but was nevertheless an ardent admirer of the material progress that was made in the West. He was the first Ottoman Sultan who travelled to Western Europe, visiting a number of important European capitals including Paris, London, and Vienna in the summer of 1867.

Apart from his passion for the Ottoman Navy, which had the world's third largest fleet in 1875 (after the British and French navies), the Sultan took an interest in documenting the Ottoman Empire. He was also interested in literature and was a talented classical music composer. Some of his compositions, together with those of the other members of the Ottoman dynasty, have been collected in the album European Music at the Ottoman Court by the London Academy of Ottoman Court Music. He was deposed on grounds of mismanaging the Ottoman economy on 30 May 1876, and was found dead six days later under unnatural and mysterious circumstances.

The Bulgarian Exarchate (Bulgarian: Българска екзархия Balgarska ekzarhiya, Turkish: Bulgar Eksarhlığı) was the official name of the Bulgarian Orthodox Church before its autocephaly was recognized by the Ecumenical See in 1945 and the Bulgarian Patriarchate was restored in 1953.

The Exarchate (a de facto autocephaly) was unilaterally (without the blessing of the Ecumenical Patriarch) promulgated on May 23 [O.S. May 11] 1872, in the Bulgarian church in Constantinople in pursuance of the March 12 [O.S. February 28] 1870 firman of Sultan Abdülaziz of the Ottoman Empire.

The foundation of the Exarchate was the direct result of the struggle of the Bulgarian Orthodox against the domination of the Greek Patriarchate of Constantinople in the 1850s and 1860s. In 1872, the Patriarchate accused the Exarchate that it introduced ethno-national characteristics in the religious organization of the Orthodox Church, and the secession from the Patriarchate was officially condemned by the Council in Constantinople in September 1872 as schismatic. Nevertheless, Bulgarian religious leaders continued to extend the borders of the Exarchate in the Ottoman Empire by conducting plebiscites in areas contested by both Churches.In this way, in the struggle for recognition of a separate Church, the modern Bulgarian nation was created under the name Bulgar Millet.