Rubuta ci gaba ga wannan sakin layi - Zrinski ya riga ya bambanta kansa a farkon shekarun ashirin a lokacin da aka kewaye Vienna
a 1529, wanda aka ba shi da doki da sarkar zinariya. Bayan mutuwar mahaifinsa Nikola III a shekara ta 1534, Nikola IV tare da babban ɗan'uwansa Ivan I sun gaji kadarori a Pounje, kuma a lokaci guda suka fara ƙarfafa su da kuma yin hulɗa da Ottomans, waɗanda suke biyan haraji na shekara kamar mahaifinsu. Koyaya, tsakanin 1537 da 1540 sun fara yaƙi da sojojin Gazi Husrev-beg don ikon Fort Dubica.