Original: Casimir I the Restorer (; b. KrakÃ w, 25 July 1016 - d. PoznaÅ, 28 November 1058), was a Duke of Poland of the Piast dynasty and the de facto monarch of the entire country since 1034 until his death.
Simplified: Casimir I the Restorer (; b. KrakÃ w, 25 July 1016 - d. PoznaÅ, 28 November 1058), was a Duke of Poland. He was a part of the Piast dynasty.