|Grand Prince of Serbia|
Uro? I was the son of Marko[a], who was a son of Petrislav Vojislavljevi? and brother of Grand Prince Vukan, who had sworn an oath of loyalty to Constantine Bodin, the Grand Prince of Duklja, becoming his vassals. Marko, as the subordinate ruler, would have had his appanage in lands north of Ra?ka, bordering the Kingdom of Hungary. The name Uro? itself, is most likely derived from the Hungarian word úr meaning "dominus" or "princeps", which is translated into the Slavic name 'Prvoslav', or 'Primislav', as seen in the case of Uro? II in Slavic sources. It is a possibility that Marko married a Hungarian wife.
In 1092, the Serb Army defeated the Byzantine Army led by the governor of Durazzo, sent by Alexius Comnenus. In 1093, Alexius himself led a larger Byzantine Army and marched towards Ra?ka, but Vukan heard of this and immediately sought peace, which Alexius quickly accepted as new problems arose in the east where the Cumans penetrated as far as Adrianople. As soon as the Emperor had departed, Vukan broke the treaty, conquering the Vardar and taking the cities of Vranje, Skoplje and Tetovo. In 1094 or 1095, the Emperor once again marched to the Serbs, capturing Lipljan. This time Vukan met with him in his tent and gave him some twenty hostages, including Uro? I and Stefan Vukan, as an oath of peace. Uro? was first mentioned in the contemporary Alexiad of Anna Komnene, a written account of the reign of her father Byzantine emperor Alexios I Komnenos.
Following the death of Vukan in 1112, Uro? succeeded as Grand Prince.
In 1113 or 1114, the Byzantine Army based in Durazzo invaded Duklja and captured the capital of Scutari. Duklja at the time was ruled by Prince ?or?e of Duklja (r. 1118), the son of Constantine Bodin. The Byzantines installed Grube?a Branislavljevi? after 1118, banishing ?or?e to Ra?ka. ?or?e claimed protection of Uro?, and in the 1125 the two led an army against Grube?a, meeting in the Battle of Antivari. Grube?a was killed and ?or?e retained his realm, although not all of it. Small parts were ruled by cousins, among them the three brothers of Grube?a, who would soon quarrel with ?or?e. The Byzantines again invaded the coastlands of Duklja, giving nominal rule to Gradinja, resulting in a guerilla war in the woods. The second expedition captured ?or?e. He was taken to Constantinople where he died. Gradinja strengthened the ties with Serbia.
In around 1130, he married his daughter, Jelena, to King Béla II of Hungary. Bela II, being blind, relied entirely on Jelena who acted as a co-ruler. Jelena is sourced as having decided to massacre 68 aristocrats at the Arad assembly, who had persuaded Coloman to blind her husband.
In 1137, Ladislaus II, the son of Béla II and Jelena, became the titular Ban of Bosnia.
When Bela II died on 13 February 1141, the eldest son Géza II ascended the throne, still a child. Therefore, Helena and her brother Belo? Vukanovi?, whom she had invited to the court, governed the Kingdom of Hungary until September 1146 when he came of age.