After Croatia's King Stjepan Držislav died in 997, his brother Svetoslav Suronja had become King of Croatia. Together with his two brothers Gojslav and Krešimir, they fought between each other for the crown in a civil war. The two brothers probably used his alliance with the Byzantine Empire to ask Bulgaria for help. During that time, a Bulgarian invasion was taking place in which the Bulgarian monarch Samuil pillaged the Dalmatian cities and great parts of Bosnia. During last two years of the Croatian civil war, the revolters had managed to depose Svetoslav Suronja probably with some Bulgarian help, who later turned to the Venetian Doge for alliance in year 1000. Answering that political change, the Venetian Doge Pietro II Orseolo started military intervention in Dalmatia in which he will emerge victorious. In Trogir, which was brought under Venetian control, there was a meeting between Doge Pietro Orseolo II and the deposed king, in which his son Stephen was to be taken hostage and marry the Doge's daughter, Joscella Orseolo, as part of the agreement made at their meeting. It is assumed that he is the same one who succeeded Krešimir III as king, but this is controversial, since the father ofking Stephen is referred as Krešimir in other sources. At that point, all the Dalmatian rulers submitted to the Doge "except for the King of the Croats". Around 1015, Krešimir was given the honorary title of patrician from the Byzantines, possibly as a token of gratitude for his policy in the Balkans. The war between Venice and Croatia was renewed in Summer 1018, when Krešimir launched a campaign against the Dalmatian cities in an attempt to retake the lost territories. The cities requested Otto Orseolo for help, who intervened on the eastern coast of the Adriatic Sea and managed to successfully repel these incursions from Croatia. According to surviving legal documents, the islands Krk and Rab, that were previously under Croatian control, restated their allegiance to Venice and promised to pay an annual tribute. Krešimir III and Gojslav have spent their reign attempting to restore control over the Dalmatian cities that were now under Venetian rule. After the defeat and absorption of the First Bulgarian Empire, John Skylitzes records that, certain Croats "who had two brothers as their rulers", after approaching Basil, had subjected themselves to him, after which the tribes did as well. Later chronicler Cedrenus, makes a similar record, instead implying that the two brothers had subjected themselves to him.
Later years
On 1 September 1024, Basil Boioannes, Byzantine general and governor of the Byzantine Catapanate of Italy sailed across the Adriatic from Bari and invaded Croatia. In subsequent clashes, he captures Krešimir's wife, who was first taken to Bari, and then to Constantinople as a hostage. Although Croatia and Boioannes maybe have harbored ill will towards each other, this clash does not necessarily prove that Constantinople itself suffered poor relations with Croatia. After the death of Emperor Basil II in 1025, Krešimir stopped paying tribute to the empire. Around 1027, he collaborated with Stephen I of Hungary against Venice in an attempt to regain the cities of Dalmatia. The Hungarian king previously took his nephew Peter Urseolo, who was forced to flee from the republic when his father was deposed in a 1026 revolt. It is also assumed by one chronicle that Krešimir took part in the 1030 war against the Holy Roman Emperor Conrad on the Hungarian side, though this is not corroborated in any other source. Stephen I also might have betrothed his son, Emeric, to one of Krešimir's daughters, however records show that the preparations were cancelled due to Emeric's sudden death. Krešimir was succeeded by his nephew Stjepan around 1030, when he returned from Venice back to Croatia.
Literature
Ferdo Šišić, Povijest Hrvata u vrijeme narodnih vladara, 1925, Zagreb
Fine, John V. A.. When Ethnicity Did Not Matter in the Balkans: A Study of Identity in Pre-Nationalist Croatia, Dalmatia, and Slavonia in the Medieval and Early-Modern Periods. Ann Arbor: University of Michigan Press.
Mladen Švab, , Historijski zbornik, god. XXXVI pp. 119–160
