Boroldai

Boroldai (or Burulday, Borolday), also known as Burundai, (Cyrillic: Боролдай) (died 1262) was a notable Mongol general of the mid 13th century. He participated in the Mongol invasion of Russia and Europe in 1236-1242.

The clan of Borolday is not clear. He was probably from one of four tribes that Chinggis Khaan (1162–1227) assigned to his eldest son, Jochi: the Sanchi'ud (or Salji'ud), Keniges, Uushin, and Je'ured clans.

Serving under Jochi's successor and son, Batu Khan, Borolday's vanguard surprised and crushed the great army of Yuri II, the Grand Prince of Vladimir, at the battle of the Sit River in 1238. He also participated in the Siege of Kiev in 1240. After the conquest of Rus, the Mongols invaded Eastern and eastern Central Europe. His name appears as Bujgai or Bujakh in The Secret History of the Mongols. According to The Secret History of the Mongols, Ögedei, Khagan of the Mongol Empire, praised Subutai and Bujgai's merit when he blamed his son Güyük's arrogant behaviour. Borolday assisted Subutai to prepare the strategy of the final assault during the Battle of Mohi (1241). Borolday's division directly attacked the main camp of King Béla IV of Hungary. Batu's brother Shiban's vanguard supported this attack. After a very hard fight, Batu's army crushed the Hungarians and their allies, Croats and Templar Knights at Mohi on April 11, 1241.

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