The developed Middle Ages were the period when the noble Čupori Moslavački family appeared in the area of today's Moslavina region. The generally accepted theory is that the Čupori derive their origin from the Moslavački family who lived in the same area before. Stjepan II is considered to be the founder of the Čupor family, of which Čupor is no longer used as a nickname but is used as a designation of a family name. Stjepan II Čupor is a descendant of Makarije Moslavački. Čupori Moslavački is a family that very quickly broke through among the most prominent members of medieval society. They reach their peak of power in the 15th century. The most influential members of the family were Pavao Čupor, who played the role of Ban of Slavonia. Even more famous was his son Demetrije, who is perhaps the most famous member of the Čupor family, Demetrije was inscribed in the family tree as the bishop of Zagreb. Not everyone approved of the aspirations of Čupor Moslavački and some other dignitaries to make Demetrije a bishop, so Demetrije tried for 25 years to get the episcopal see. Likewise, Demetrius' nephew Nikola was very famous, during whose time Čupor's estates greatly increased. The family of the Moslavina Čupor died out in 1492, and Stjepan VI is known as the last Čupor. His will, although not the most comprehensive, is one of the most interesting sources for the Čupor family, and his last wishes are known from his will. Since Stjepan had no descendants, the estates of Čupor Moslavački began to be divided. There were several stakeholders for their estates. The final blow in the division of estates was put by king Vladislav Jagelović, who, in violation of Stjepan's will, gave their estates to Tomo Bakač, who would later become known as Erdödy. With the Moslavački Čupors, the era of prosperity for this medieval region ended, because very soon after the arrival of Erdödy, they would find themselves in danger from the Ottomans.