Principality of Beloozero

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Principality of Beloozero or Beloozero Duchy (Белозерское княжество in Russian) was a Russian principality or duchy. It was formed in 1238 after its detachment from the Principality of Rostov. The town of Beloozero (today's Belozersk) became its capital. Gleb Vasilkovich was the first prince of Beloozero (ca. 1238-1278). During his reign, the duchy's territory embraced the basin of the White Lake (Белое озеро, or Beloye ozero), lower streams of the Sheksna River, and Lake Kubenskoye.

In the 1st half of the 14th century, the duchy lost its significance. In 1389, it became an appanage of the Muscovy. In 1486, it was turned into Muscovy's uyezd. Numerous descendants of the ruling Rurikid princes moved to Moscow and continue in a male line to the present.