Bolesław I the Brave in 1025 he had himself crowned King of Poland. He was the first Polish ruler to receive the title of "rex" (Latin: "king"). He was an able administrator who established the "Prince's Law" and built many forts, churches, monasteries and bridges. He introduced the first Polish monetary unit, the "grzywna", divided into 240 "denarii", and minted his own coinage. Bolesław I is widely considered one of Poland's most capable and accomplished Piast rulers. Bolesław was born in 966 or 967, the first child of Mieszko I of Poland and his wife, the Bohemian princess Dobrawa. His "Epitaph", which was written
Mieszko I Tanglefoot p. 876). This is the oldest preserved record of the Mieszko's nickname in the form of "Plątonogi". From 1146, after the deposition of his father, Mieszko and his family mainly lived in the town of Altenburg in Saxony, which was granted as a temporary possession to Władysław II by his brother-in-law, King Conrad III of Germany. During his time in exile, Mieszko studied in Michaelsberg and Bamberg. However, the supposed temporary exile was, for the deposed High Duke, for good; he died in Altenburg in 1159. His sons continued the fight to recover their inheritance, and finally three years later,