It was good that he didn't, because the Šubić's party was massacred near Knin and Juraj II Šubić himself was captured by Prince Nelipić soon. Stepan had attempted to liberate Juraj II from imprisonment, but all attempts have reached failure. Prince Nelipić immediately pushed the fight against Stepan II. Nelipić managed to conquer the city of Visuć, but Stepan's long-ago given privileges to the nobility had finally been proven useful, as "Vuk of Vukoslav" had helped him to retake the city. Although Stepan's military ambitions only relatively successful he continued to wage war against the enemies of the Šubićs. His target was the City of Trogir which was one of the major supporters of Nelipić's campaigning. Stepan has adopted a harsh tactic. His forces have raided Caravans from Trogir, which eventually forced its denizens to humbly sign peace and addressed to him as the "high and mighty lord Stepan free ruler and master of Bosnia, Usora and Soli and many other places and Prince of the Hum". It is because of this that Stepan opened a conflict with the Republic of Dubrovnik regarding trade. Stepan was shown as a very tough negotiator and the negotiations have finally ended in 1326. After seeing that Ban Nicholas Felsőlendvai was unable to weaken the position of Prince Nelipić, Hungarian King Charles I Robert deposed him. The new man for the job was one o his most trusted men, Mikcs Ákos. Ban Mikcs advanced to Croatia in the Summer of 1325. Bosnian Ban Stepan II sent squadrons of troops to assist him in his offensive. In 1326, Mikcs took the cities of the Babonić family advance deeper into Croatia, meeting with Stepan's reinforcements. The expedition eventually reached little success, so Mikcs sent a portion of his army to Bihać which would serve as defence against possible Nelipić's counterattacks and retreated to Hungary, to the King. Ivan Nelipić had a nephew, Konstantin, who helped him in his reign. Soon after Nelipić's death in 1344, Konstantin also died 1355. Nelipić was married to princess Vladislava Kurjaković from Krbava and had a son Ivan II Nelipac.