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Wiki information Boroldai:
Boroldai, also known as Burundai, 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...
The second Mongol invasion of Poland was carried out by general Boroldai in 1259-1260. During this invasion the cities of Sandomierz, Kraków, Lublin, Zawichost, and Bytom were sacked by Mongols for the second time.