French post offices in the Ottoman Empire
The French post offices in the Ottoman Empire were post offices in various cities of the Ottoman Empire run by France between 1812 and 1923. France was one of a half-dozen European countries, the others being Austria, Russia, Great Britain, Germany and Italy, which had been granted the right to maintain post offices within the Empire.
Source: Wikipedia — French post offices in the Ottoman Empire (CC BY-SA 4.0)