The area was conquered by the Ottomans in the 16th century during the Ottoman–Safavid War (1532–1555) against their Iranian Safavid arch-rivals.
[13] On August 10, 2020, the three traditional Armenian parties—the Armenian Revolutionary Federation (ARF, Dashnaks), Social Democrat Hunchakian Party (Hunchaks) and the Armenian Democratic Liberal Party (Ramgavars)—issued a joint statement on the centenary of the Sèvres Treaty, stating that the treaty is the only international document defining the border between Armenia and Turkey.
Today, the most common is Arevmtyan Hayastan (Արևմտյան Հայաստան) in Eastern Armenian (mostly spoken in Armenia, Russia, Georgia, Iran) and Arevmdean Hayasdan (Արեւմտեան Հայաստան) in Western Armenian (spoken in the Diaspora: US, France, Lebanon, Syria, Argentina, etc.).
Archaic names (used before the 1920s) include Tačkahayastan (Տաճկահայաստան) in Eastern and Daǰkahayasdan in Western Armenian.
Also used in the same period were T'urk'ahayastan (Թուրքահայաստան) or T'rk'ahayastan (Թրքահայաստան), both meaning Turkish Armenia.
[18] In the Turkish language, the literal translation of Western Armenia is Batı Ermenistan.
[19] After the Ottoman-Persian War (1623–1639), Western Armenia became decisively part of the Ottoman Empire.
[24] The Sazonov–Paléologue Agreement of 26 April 1916 between Russian Foreign minister Sergey Sazonov and French ambassador to Russia Maurice Paléologue proposed to give Western Armenia to Russia in return for Russian assent to the Sykes–Picot agreement.