Sary-Aka's embassy

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Sary-Aka's embassy (Russian: Посольство Сарайки) was a mission from the commander of the Blue Horde Mamai sent to the Russian eastern border province of Nizhny Novgorod in 1374 to undermine the influence of the Prince of Moscow in his struggle for supremacy among the Russian provinces due to his open opposition to Mongol authority in Russia. The embassy was ambushed and the survivors were imprisoned in the wooden fort of Nizhny Novgorod until 31 March 1375, when Sary-Aka along with the rest of the Tatars were massacred by the Russians.