When Tekuder assumed the throne in 1282, he turned the Ilkhanate into a sultanate. Tekuder zealously propagated his new faith and sternly required his ranking officers to do the same. Although, Kublai was angry with the situation, Arghun had to overthrow Tekuder himself given that the Great Khan"s empire was far away from Persia.
Tekuder sent a friendly letter to the Mamluk sultan and wished for peace.
When Arghun received no reply, he declared war against Tekuder. Tekuder requested help from the Mamluk Sultan but the Mamluks did not fully co-operate with Tekuder.
Having a small and inferior army, Tekuder was defeated by Arghun"s larger army, and he was eventually executed on August 10, 1284.