Casimir I kăs´əmēr [key], c.1015–1058, duke of Poland (c.1040–1058), son of Mieszko II. He succeeded in reuniting the central Polish lands under the hegemony of the Holy Roman Empire, but he was never crowned king. He is also called Casimir the Restorer. His son and successor was Boleslaus II.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2023, Columbia University Press. All rights reserved.
See more Encyclopedia articles on: Polish History: Biographies