The administrative division of the Kingdom of Poland evolved over the several centuries. The 11th century Testament of Bolesław III Krzywousty split the early Kingdom of Poland into several provinces (prowincja). The 14th century Wiślica Statutes and Statutes of Casimir the Great also used the term province. Eventually, during the unification of Poland after the fragmentation, the provinces - some of them for a period known as duchies (ex. Duchy of Masovia) - became known as lands (ziemia).