City revenues strengthened the power of Peter Kresimir, which he further strengthened by encouraging the development of Croatian cities Biograd, Karina, Skradin, Sibenik and Nin, and the establishment of many monasteries and donating land to a church. Thus, the 1066th released privilege monastery of St.. Mary in Zadar, where the founder and first abbess was the Uncle of the genus Madijevaca, his stepsister. This is an important monastery in the Croatian cultural heritage, and for maintaining the relevant Croatian Zadar, to which was fixed later Venetian and Italian appropriation.
All these great changes which he was the state border "Almighty God has spread on land and sea" ("Deus quia omnipotenus terra marique prolungavit regnum nostrum"), decided to King Petar Kresimir IV. express my gratitude to Nina 1069th gift of the island monastery of St. Mauna. Grisogono of Zadar. On the occasion of this event, Kresimir IV. pointed out that it was "our own island which lies on our Dalmatian sea" ("Nostra propria insul in nostro Dalmatica care sitam, que vocatur Maun"), which is also evidence that the Croats were then ruled the Adriatic Sea.