| Stephen Držislav|
| Krešimir III of Croatia and Gojslav of Croatia|
House of Trpimirović, founder of House of Svetoslavić
Stephen Držislav of Croatia
Demetrius Zvonimir of Croatia
Michael Krešimir II of Croatia, Helen of Zadar
Prince Radovan, Princess Klaudija
Krešimir III of Croatia, Stephen Držislav of Croatia, Demetrius Zvonimir of Croatia, Helen of Zadar, Irene Doukaina Laskarina
Svetoslav Suronja ([sʋětoslaʋ sǔːroɲa]), was King of Croatia from 997 to 1000. A member of the Trpimirović dynasty, he reigned with the help of his ban, Varda. John the Deacon (d. 1009) called him Surinja (Latin: Surigna), adopted in Croatian historiography as Suronja, meaning "dark man" or "cold man", probably due to his temper. He was the oldest son of king Stjepan Držislav, from whom he received the title of Duke, and was designated as his successor.
Svetoslav Suronja Wikipedia
After the death of their father, his brothers Krešimir and Gojslav started organizing a rebellion against him since Svetoslav rejected sharing power over the kingdom. The brothers had asked Bulgarian emperor Samuil for aid, even though the emperor was at war with the Byzantine Empire. In the war, the Byzantines were supported by Venice and Svetoslav Suronja, who had continued his father's policy. Samuil had accepted the revolters' invitation and attacked Croatia in 998, which started the last of three Croatian-Bulgarian wars. In his rampage, he took all of Croatian Dalmatia up to Zadar after which he ended his rampage, returning home to Bulgaria through Bosnia. Samuil gave all the territory he took to the revolters Krešimir and Gojslav. Using this newly gained territory and further Bulgarian aid, the brothers overthrew their elder brother, Svetoslav Suronja, and became rulers of Croatia.
Svetoslav's reign was particularly unpleasant for the Dalmatian cities, as they were occasionally raided and pillaged by his supporters. The cities asked the Venetian Republic for help in autumn of 999, which encouraged Venice to make a pact with the Byzantine Empire in order to secure the cities for themselves. Using events like the casus belli, the Venetian Doge Pietro II Orseolo launched a campaign in Dalmatia against Croatia in 1000. During May, Croatia lost the islands Cres, Lošinj, Krk and Rab to the Doge, who was eventually received in Zadar and recognised as its master. Svetoslav sent envoys to the city offering peace, but the Doge declined and decided to further his campaign. From here the island Pašman was taken and, with negotiations, the city of Biograd.
Svetoslav's descendant, Dmitar Zvonimir, will later become the Croatian king in 1074.