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Kazimierz Odnowiciel (Casimir the Restorer) and Boleslaw Śmialy (Boleslaus the Bold)
It was not until the reign of Casimir, Mieszko II's son, that stability was restored. The Restorer reunited the country administratively, recuperating Silesia, Mazovia and Pomerania thanks to the help of the Emperor Conrad and skilful alliances, especially with Kievan Rus. Poland rose in international standing. His son Boleslaus the Bold continued Casimir's policy.  |  |  |  |  | |  | |  | Wawel Castle, Cracow, principal seat of the kings of Poland from the 10th to the 16th century |  |
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|  |  |  | Thanks to his military talents and the support he gave the Pope in the investiture conflict with the Emperor he managed to regain the crown. He influenced the installing of princes in Ruthenia (Kievan Rus) and Hungary, and halted the eastward expansion of the Holy Roman Empire. However, in 1079 he forfeited the throne in outcome of a rebellion supported by the Empire and Bohemia. Another contributing factor was the conflict between the King and Stanislaus, Bishop of Cracow, which resulted in the withdrawal of the Church's support for Boleslaus.
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