The fall of Bosnian Kingdom marked the beginning one of the most difficult epochs for the Croatian people. Over a period of 200 years, the Croatian Kingdom was reduced to “the rest of the remnants”, demographic losses were about 60% percent of the total population due to the wars against the Ottomans. Croatian nobles were on the border with the Ottoman Empire. They in addition to the mercenaries oversaw defence of the kingdom with their own armies and resources. One of these noble families were the lords and later the counts Zrinski, who from the time of Peter II. Zrinski to Juraj IV. Zrinski and their descendants who were the defenders of the borders from the Ottoman conquest, plundering and killing. Although Zrinski family defended their own interests, they coincided with the interests of the Croatian people and kingdom. The Zrinski family was a cohesive factor in Croatian lands and without their merits it would be difficult to imagine the defence of Croatia. They played an important role in the political life of the Kingdom of Hungary and Croatia, as bans, captains, politicians, and more. The Zrinski family, which has been in decline since the 14th century turned theirs fate with the arrival of the Ottoman threat on the territory of the Kingdom of Hungary and Croatia. They experienced a renaissance of their family of the kind they did not have from Pavle Šubić Bribirski. The Counts Zrinski spread their influence through the kingdom in various ways and so in the end during the life of Juraj IV. Zrinski became one of the most powerful aristocratic families in the kingdom. Marital relations, personal service and many other duties and carefully thought-out activities were the reason for the survival and expansion of the Counts Zrinski. As such, they deserved their place in early modern Croatian and Hungarian history.