English: Group of Students of Mekteb-i Aşiret-i Humayun (Imperial Tribal School), which was an Istanbul school founded in 1892 by Abdulhamid II to promote the integration of tribes into the Ottoman empire through education. Abdullah Frères — Viçen (1820-1902), Hovsep (1830-1908) and Kevork Abdullah (1839-1918): three armenian brothers who ran a commercial studio in Constantinople with branches in Cairo and Alexandria. In 1862, named official photographers to the court of Sultans Abdul Aziz and Abdul Hamid II, they were commissioned to document the Ottoman Empire.
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