In the 16th <answer>century</answer>, the Ottoman Empire and Safavid Empire divided Armenia. From the early 16th <answer>century</answer>, both Western Armenia and Eastern Armenia fell under Iranian Safavid rule. Owing to the <answer>century</answer> long Turco-Iranian geo-political rivalry that would last in Western Asia, significant parts of the region were frequently fought over between the two rivalling empires. From the mid 16th <answer>century</answer> with the Peace of Amasya, and decisively from the first half of the 17th <answer>century</answer> with the Treaty of Zuhab until the first half of the 19th <answer>century</answer>, Eastern Armenia was ruled by the successive Iranian Safavid, Afsharid and Qajar empires, while Western Armenia remained under Ottoman rule.
How long did the Turco-Iranian rivalry last?
century