The Ozalj area is a very dialectological interesting area. Numerous historical events have caused frequent changes, and as a consequence, changes are visible in the language as well. The arrival of the Zrinski and Frankopan contributed to the enrichment of the city's history, but also to numerous valuables such as architectural, cultural and artistic values. The cultural activity from the period of the Zrinski and Frankopan is better known as the Ozalj cultural circle, and is based on the literary language characterized by its threefold dialects - Chakavian, Shtokavian and Kajkavian. The Urbar of the town of Ozalj is a written monument of the 17th century that gives a picture of feudal relations, people and life in some ancient times, and is excellent as a source of knowledge of the historical course of language and is useful as a source of historical dialectological situation. Because of this, Ozalj's Urbar served as a template for research into dialectological determinants and a model for determining and classifying the language state. The analysis proved that the language Ozalj's Urbar during the 17th century was mostly richer in Chakavian determinants, but sporadically Kajkavian and Shtokavian characteristics also appeared.