The Christianisation of Poland (Polish: chrystianizacja Polski) refers to the introduction and subsequent spread of Christianity in Poland. The impetus to the process was the Baptism of Poland , the personal baptism of Mieszko I, the first ruler of the Polish state, and much of his court. The ceremony took place on the Holy Saturday of 14 April 966, although the exact location is still disputed by historians, with the cities of Poznan and Gniezno being the most likely sites. Mieszko's wife, Dobrawa of Bohemia is often credited as a major influence on Mieszko's decision to accept Christianity.