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Jagoldai (Tatar Turkic: Cağolday, Cağalday, Polish: Jaholdaj, Jahołdajewszczyzna, Russian: Яголдаева тьма) (pronounce: yah-gohl-DAI or jah-ghahl-DAY) – little Tatar Turkic tyumen (duchy) in today Kursk Oblast and Belgorod Oblast of Russia as well as the Sloboda Ukraine, vassal of the Grand Duchy of Lithuania in 15th-16th century.
It was founded in 1438 by Tatars of Golden Horde.
References
Jagoldai Wikipedia(Text) CC BY-SA