50Zl Polish Rulers Series Casimir I the Restorer 1016-1058 Reigned as Duke 1040-1058. He known as the Restorer because he managed to reunite all parts of the Polish Kingdom after a period of turmoil. He reinstated Masovia, Silesia and Pomerania into his realm. However, he failed to crown himself King of Poland, mainly because of internal and external threats to his rule. Polish Eagle