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'Dayan Khan' (given name: 'Batu Möngke'; ?-1543?), was a Mongol Khan who reconstructed the Mongol Empire.
An orphan at age five, he was adopted by Mandukhai Khatun, the wife of Manduulun Khan who died in 1467. As a direct descendant of Kublai Khan, she had him ascend to the throne. When he was aged nineteen, she married him, and retained great influence over court and military. They reunified the Mongol retainers of the Yuan Dynasty. The Oirats were defeated and control reclaimed over the Eastern Mongols.
His sons were made tribal chiefs. Many princes in Mongolia were his descendants.
He reorganized the Mongols by tümen (literally "ten thousand") as follows.
Right Wing: Chahar, Khalkha and Uriyangkhan

Left Wing: Ordus, Tümed and Yöngshiyebü

Others: Ongluud, Öjiyed, Asud and Kharachin

Dayan Khan and his successors led the Chakhar tümen.
Altan Khan was his grandson.