Poljica is an area east of Split, between the Cetina and Žrnovnica rivers, and from the 13th century it enjoys its own autonomy and is called the Republic of Poljica or duchy (Croatian: Poljička republika). The name was given by the small fields beneath the Mosor mountain. Through their long history they recognized the power of various rulers Croatian, Croat-Hungarian, Venetian, Turkish and others. The area was dominated by the princes Kačići, Šubići and Frankopani. Poljica's history is elucidated by two historical sources, Sumpetar cartulary and Poljica statute. Sumpetar cartulary is important because it contains a number of documents from the time of king Zvonimir and testifies of economic relations at the turn of the early to developed Croatian Middle Ages. The Poljica statute provides a series of data and information about social inorganization of the community of Poljica in the Middle Ages. It is also significant that it contains a series of laws that should be respected, and it introduces us to a medieval society of Poljica consisting of “didići”, “ugričići” or “vlastela”, “Vlasi”, commoners and free peasants and serfs.