Stephen IV of Hungary in the context of Székesfehérvár

Stephen III (Hungarian: III. István, Croatian: Stjepan III.; Slovak: Štefan III.; summer of 1147 – 4 March 1172) was King of Hungary and Croatia between 1162 and 1172. He was crowned king in early June 1162, shortly after the death of his father, Géza II. However, his two uncles, Ladislaus and Stephen, who had joined the court of the Byzantine Empire, challenged his right to the crown. Only six weeks after his coronation, the Byzantine Emperor Manuel I Komnenos launched an expedition against Hungary, forcing the Hungarian lords to accept Ladislaus' rule. Stephen sought refuge in Austria, but returned and seized Pressburg (now Bratislava in Slovakia). Ladislaus, who died on 14 January 1163, was succeeded by Stephen's younger uncle and namesake, Stephen IV, without resistance, but his rule was unpopular. The young Stephen defeated his uncle on 19 June 1163 and expelled him from Hungary.

Stephen IV attempted to regain his throne with Emperor Manuel I's support, but the latter made peace with Stephen III. He agreed to send his younger brother, Béla, to Constantinople and to allow the Byzantines to seize Béla's duchy, which included Croatia, Dalmatia and Sirmium. In an attempt to recapture these territories, Stephen III waged wars against the Byzantine Empire between 1164 and 1167, but could not defeat the Byzantines.

Ladislaus II or Ladislas II (Hungarian: II. László, Croatian and Slovak: Ladislav II; 1131 – 14 January 1163) was King of Hungary and Croatia between 1162 and 1163, having usurped the crown from his nephew, Stephen III.

Ladislaus received the title of Duke of Bosnia from his father, Béla II of Hungary, at the age of six but never ruled the province. Instead, around 1160, he followed his younger brother, Stephen's, example and settled in Constantinople but both were to return to Hungary following the death of their elder brother, Géza II of Hungary, in 1162. Their return was backed by the Byzantine Emperor Manuel I Komnenos who used their return in a bid to expand his suzerainty over Hungary. Initially, the Emperor was planning to assist Stephen IV in seizing the throne, but the Hungarian lords were only willing to accept Ladislaus as king against the late Géza II's son, Stephen III.

Helena of Serbia (Serbian: Јелена/Jelena, Hungarian: Ilona; b. after 1109 – after 1146) was Queen of Hungary and Croatia as the wife of King Béla II. After her husband's death, she governed Hungary as regent from 1141 to September 1146 together with her brother, Beloš, during the minority of her eldest son, Géza II, came of age.

A daughter of Prince Uroš I of Serbia (r. ca. 1112–1145), she was arranged to marry Béla II in 1129 by his cousin, King Stephen II (r. 1116–1131). Her younger sons, Ladislaus II and Stephen IV, also ruled as kings of Hungary. She had two other brothers Uroš II and Desa besides Beloš.