Tarmashirin

Tarmashirin Khan (ruled 1331AD - 1334AD) was the khan of the Chagatai Khanate following Duwa Timur.

Tarmashirin is famous for his campaign in India in 1327 before he was enthroned. He destroyed every army on his way to Delhi. The Delhi Sultan gave him a large tribute to spare his life. Also, he unsucessfully invaded the Ilkhanate.

He was the second ruler of the Chagatai Khanate to convert to Islam, Mubarak Shah having been the first. He took the name Ala-ad-din after becoming a Muslim. His conversion to Islam did not go down well with his Mongol nobles, who were overwhelmingly Shamanist/Buddhist (Buddhist traces can be detected in Tarmashirin's own name itself, which is a corruption of the Sanskrit word "dharmashri"). Tarmashirin was accused of abandoning the traditional Mongol code of conduct, Yassa, and was deposed in the horde's annual kurultai. He was killed later in flight near Samarkand.
Muslim sources have always portrayed Tarmashirin in a very favorable light owing to his seminal effort in bringing Islam into inner Asia. The famous Muslim traveler and writer Ibn Batuta had visited Tarmashirin during his travel through Tarmashirin's realms.

Reference:

*The Chaghadaids and Islam: the conversion of Tarmashirin Khan (1331-34). "The Journal of the American Oriental Society", October 1, 2002. Biran