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When Béla ascended the throne in 1235, Pousa was appointed voivode of Transylvania for the second time. In 1241, Transylvania suffered during the Mongol invasion of Europe. Güyük Khan invaded the province from the Oituz Pass in March. Voivode Pousa fought them with his royal army near Burzenland (), where he fell in battle on 31 March 1241. The Mongols continued their campaign toward the interior of the Kingdom of Hungary.