In 1242, king Bela IV gave a royal privilege to the citizens and settlers of Gradec. The town of Gradec was founded on the hill Grič itself, within the newly built walls. For his support, the king donated the land that stretched from the top of mountain Medvednica to the northern bank of the Sava River between the bishop's estate on the east side and the Kaptol estate on the west side. Outside the walls on the territory of the city were serf villages inhabited by city serfs. The topic of this work was to present the role and life of city serfs villages that were located on the northern bank of the Sava in the period from the 13th to the 16th century. Relying on published medieval documents and relevant historical works, three settlements were located, Nova Villa, Trnje, and Horvati, which were located near the northern bank of the Sava River in the mentioned period. Through the analysis of published medieval documents in this work is presented the legal relations and economic activity of the serfs that lived in the said villages, and how changes in the wider area of medieval Croatia and Slavonia, mostly caused by the invasions of the Ottomans, reflected on changes in Gradec's villages on the north bank of the Sava from the 13th to the 16th century.