Buyan Sechen Khan was a Mongol khan

Khan (title)

Khan is an originally Altaic and subsequently Central Asian title for a sovereign or military ruler, widely used by medieval nomadic Turko-Mongol tribes living to the north of China. 'Khan' is also seen as a title in the Xianbei confederation for their chief between 283 and 289...

 of the Northern Yuan Dynasty in Mongolia

Mongolia

Mongolia is a landlocked country in East and Central Asia. It is bordered by Russia to the north and China to the south, east and west. Although Mongolia does not share a border with Kazakhstan, its western-most point is only from Kazakhstan's eastern tip. Ulan Bator, the capital and largest...

 and he was the eldest son of Jasaghtu Khan

Jasaghtu Khan

Tümen Jasagtu Khan was a 16th century Mongol khan of the Northern Yuan Dynasty in Mongolia who reigned from 1558 to 1592. He was the successor of Darayisung Gödeng Khan and had direct rule over the Chahar. It was during his rule that the Mongols conquered Daur and Evenks...

 whom he succeeded. During Buyan Khan’s rule, the Mongol regime once again falling into disarray and although the great khan was recognized as the leader of all Mongols, this was in name only. Buyan Khan even attempted to show what was rumored that he had found the imperial seal

Imperial Seal of Mongolia

The Imperial Seal of Mongolia is a seal that was used by the Mongols. The imperial seals had inscriptions in Mongolian script or other scripts that used in Mongol regimes....

 of Genghis Khan

Genghis Khan

Genghis Khan , born Temujin and occasionally known by his temple name Taizu , was the founder and Great Khan of the Mongol Empire, which became the largest contiguous empire in history after his death....

 to other Mongol clans to legitimatize his rule. He ruled the people in accordance with justice and religion.