Coloman invaded Croatia in 1097. Ladislaus I had already occupied most of the country, but Petar Svačić, the last native king of Croatia, resisted him in the Kapela Mountains. Petar Svačić died fighting against Coloman's army in the Battle of Gvozd Mountain. The Hungarian troops reached the Adriatic Sea and occupied Biograd na Moru, an important port. Threatened by the advance of Coloman's army, the citizens of the towns of Trogir and Split swore fidelity to the doge of Venice, Vitale Michiel, who had sailed to Dalmatia. Having no fleet, Coloman sent envoys with a letter to the doge to "remove all the former misunderstandings concerning what is due to one of us or the other by right of our predecessors". Their agreement of 1098—the so-called Conventio Amicitiae—determined the spheres of interest of each party by allotting the coastal regions of Croatia to Hungary and Dalmatia to the Republic of Venice.