Mieszko I was the first historical ruler of Poland, reigning from around 960 until his death in 992. He is known for uniting various Slavic tribes under his leadership, which laid the foundation for the Polish state. Mieszko I is also significant for his conversion to Christianity in 966, which helped to integrate Poland into the broader European community. His marriage to Dobrawa of Bohemia further strengthened political ties with neighboring regions. Mieszko I's legacy includes the establishment of the Piast dynasty, which played a crucial role in the development of Poland in the following centuries.