Daumantas of Pskov, Lithuanian prince (b. c. 1240)
Daumantas or Dovmont (Russian: Довмонт, Belarusian: Даўмонт, Christian name Timothy (Russian: Тимофей), ; c. 1240? – 17 May 1299), was a Lithuanian prince best remembered as a military leader of the Principality of Pskov between 1266 and 1299. During his term in office, Pskov became de facto independent from Novgorod.
He is venerated as a saint in the Eastern Orthodox Church with his feast day observed on 20 May.

1299May, 17
Daumantas of Pskov
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Nicomedia
According to Edward Gibbon, Osman I invades the territory of Nicomedia for the first time, usually considered to be the founding day of the Ottoman state.