The area was conquered by the Ottomans in the 16th century during the Ottoman–Safavid War (1532–1555) against their Iranian Safavid arch-rivals. Being passed on from the former to the latter, Ottoman rule over the region became only decisive after the Ottoman–Safavid War of 1623–1639. The area then became known as Turkish Armenia or Ottoman Armenia. During the 19th century, the Russian Empire conquered all of Eastern Armenia from Iran, and also some parts of Turkish Armenia, such as Kars. The region's Armenian population was affected during the widespread massacres of Armenians in the 1890s.