9th Century
The first known Polish dynasty was the Piastic or Piast, sometime in the 9th century by a peasant named Piast. His descendant was Mieszko in 966.
1. Mieszko I. of Poland, *, b. circa 922, Piast, Poland - of the Polani family of Piast , d. 992, Poland - 1st recorded ruler. from abt 960 (Age ~ 70 years)