The rule of the Piast dynasty was the first major stage in the history of Poland. The indigenous House of Piast was largely responsible for the formation of the Polish state in the 10th century and ruled until the second half of the 14th century. Mieszko I completed the unification of West Slavic tribal lands and chose to be baptized in the Latin Church in 966. His son, Boleslaus the Brave, pursued territorial conquests and was crowned as the first king of Poland. Boleslaus the Bold brought back Poland's military assertiveness, but was expelled from the country due to a conflict with Bishop Stanislaus of Szczepanów. Boleslaus Wrymouth succeeded in defending his country and recovering territories previously lost, but upon his death in 1138, Poland was divided among his sons. The resulting internal fragmentation eroded the initial Piast monarchy structure in the 12th and 13th centuries, causing fundamental and lasting changes. The kingdom was restored under Vladislaus the Elbow-high, then strengthened and expanded by his son, Casimir the Great. The consolidation in the 14th century laid the base for the new powerful Kingdom of Poland that was to follow. (Full article...)