Jagoldai

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Jagoldai (Tatar Turkic: Cağolday, Cağalday; Polish: Jaholdaj, Jahołdajewszczyzna; Russian: Яголдаева тьма; pronunciation: yah-gohl-DAI or jah-ghahl-DAY) was a little Tatar Turkic tyumen (duchy) in modern Kursk Oblast and Belgorod Oblast of Russia as well as the Sloboda Ukraine.

It was founded in 1438 by Tatars of Golden Horde.