The quest for the historical traces of Poljica in the landscape of the River Cetina recalls the period from the Prehistoric Age to the Middle Ages – a period when the ancient Illyrians built their shrines and the graves of their ancestors all over the canyon of the Cetina, when the village of Ostrvica (Krcatovići – Miri) was fortified with a Late Antique building complex (5^th-6^th century), and when – according to local tradition – the medieval settlement of Poljica was established with the arrival of the sons of the Croatian King Miroslav (10^th century) at the Pokornik water source