The Great Eastern Crisis of 1875–1878 began in the Ottoman Empire's territories on the Balkan peninsula in 1875, with the outbreak of several uprisings and wars that resulted in the intervention of international powers, and was ended with the Treaty of Berlin in July 1878.

Abdulaziz was the sultan of the Ottoman Empire from 25 June 1861 to 30 May 1876, when he was overthrown in a government coup. He was a son of Sultan Mahmud II and succeeded his brother Abdulmejid I in 1861.