free communes. Forced to turn their attention seawards, the inhabitants of Zadar focused on shipping, and the city became a naval power to rival Venice. The citizens were Dalmatian language speakers, but from the 7th century Croatian language started to spread in a region, becoming predominant in the inland and the islands to the end of the 9th century.
The Mediterranean and Adriatic cities developed significantly during a period of peace from the last decades of the 9th to the middle of the 10th century. Especially favourable conditions for navigation in the Adriatic Sea occurred since the Saracen raids had finished. Also the adjustment of relations with the Croats enabled Zadar merchants to trade with its rich agriculture hinterland where the Kingdom of Croatia had formed, and trade and political links with Zadar began to develop. Croatian settlers began to arrive, becoming commonplace by the 10th century, occupying all city classes, as well as important posts, like those of prior, judge, priest and others. In 925, Tomislav, the Duke of Croatian Dalmatia, united Croatian Dalmatia and Pannonia establishing the Croatian Kingdom. He was also granted the position of protector of Dalmatia (the cities) by the Byzantine Emperor. He thus politically united the Dalmatian cities with their hinterland.
High Middle Ages
At the time of the Zadar medieval development, the city became a threat to Venice's ambitions, because of its strategic position at the centre of the eastern Adriatic coast.
In 998 Zadar sought Venetian protection against the Neretvian pirates. The Venetians were quick to fully exploit this opportunity: in 998 a fleet commanded by Doge Pietro Orseolo II, after having defeated pirates, landed in Kor?ula and Lastovo. Dalmatia was taken by surprise and offered little serious resistance. Trogir was the exception and was subjected to Venetian rule only after a bloody struggle, whereas the Republic of Dubrovnik was forced to pay
