In 1291 a large Mongol-Bulgarian alliance raided into Serbia, where Serbian king Stefan Uroš II Milutin defeated the Mongolian contingent. However, after a threat that Nogai himself will return with the Golden Horde, the Serbian king acknowledged Nogai's supremacy and sent his son as hostage to prevent further hostility when Nogai threatened to lead a punitive expedition himself.István Vásáry Cumans and Tatars: Oriental military in the pre-Ottoman Balkans, 1185–1365, p.89
