Numerous times throughout the millennia-long history shared by the two neighboring nations, parts of the territory of Anatolia (or Asia Minor) were conquered by the various empires based in modern-day Iran, including the Median Empire, the Achaemenid Empire, the Parthian Empire, the Sassanian Empire, the Safavid Empire, and the Afsharid Empire, amongst others. In ancient times, the Asia Minor formed one of the core regions of the Achaemenid Empire, with the cities of Sardis and Smyrna in western Anatolia being the most notable. Igdir Province, in what is now Eastern Anatolia, formed part of Qajar Iran up to the outcome of the Russo-Persian War (1826-1828) and the ratified Treaty of Turkmenchay.