Žyhimont Kiejstutavič (ca. 1365-1440), Grand Duke of the Grand Duchy of Lithuania (GDL), younger son of Kiejstut, and brother of Vitaŭt. In the power struggle between Grand Duke Vitaŭt and his cousin Grand Duke Jahajła, Žyhimont sided with Vitaŭt, from whom he received the Duchy of Staradub. He participated in the battles of Vorskła and Grunwald. After Vitaŭt's death (1430), Žyhimont was elected Grand Duke of the GDL with the support of those Lithuanian and Polish magnates who were interested in promoting a union of the two states. He fought his cousin Grand Duke Śvidryhajła (r. 1432-1439), who was based in Viciebsk and was supported by Orthodox lords of Belarusian and Ukrainian lands. These lords sided with Śvidryhajła largely because they did not enjoy privileges given to their Catholic counterparts by the charters of 1387 and 1413. Žyhimont was forced to grant Orthodox landlords equal rights in the 1434 charter. He was killed in a conspiracy against him by supporters of Śvidryhajła.

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