 Despite the growing intimacy of Manchu-Mongol ties, Ligdan Khan, the last Khan from the Chakhar, resolutely opposed the growing Manchu power and viewed himself as the legitimate representative of the Mongolian imperial tradition.But after his repeated losses in battle to the Manchus in the 1620s and early 1630s, as well as his own death in 1634, his son Ejei Khan eventually submitted to Hong Taiji in 1635 and the Yuan seal is also said to be handed in to latter, ending the Northern Yuan.Ejei Khan was given the title of Prince (Qin Wang, 親王).