Casimir I the Restorer

Type Figure Region Poland Time c. 1016–1058 Also known as Casimir I the Restorer、Kazimierz I Odnowiciel、卡齐米日一世·复兴者

Casimir I (c. 1016–1058) was a Piast duke of Poland known as "the Restorer," who regained power around 1040 after Poland's fragmentation.

Timeline

c. 1034–1040Hungary · HungaryAfter the death of his brother Bolesław I, Casimir was at one point driven out by Bohemian forces and exiled to Hungary and elsewhere. With foreign aid and noble support he returned to Poland around 1040 and began "restoring" the fragmented duchy.
1041–1050Kraków · Lesser PolandBetween 1041 and 1050 Casimir gradually recovered Masovia and other lands, centering power in Kraków. He reorganized relations between the church and the nobility, married a daughter of Grand Prince Yaroslav of Kyiv to secure the eastern frontier, and coped with pressure from Bohemia and the Holy Roman Empire.
1051–1058Poland · PolandIn his later years Casimir continued to consolidate the duchy's unity and passed power to his sons. After his death in 1058 his son Bolesław II succeeded him, and Poland once again rose to strength in the Middle Ages.

Gallus Anonymus, Gesta principum Polonorum (Chronicle of the Poles) — Gallus Anonymus https://en.wikipedia.org/wiki/Gesta_principum_Polonorum
Casimir I the Restorer https://www.britannica.com/biography/Casimir-I