Helena of Serbia, Queen of Hungary

Helena was the daughter of Serbian Grand Prince Uroš I (r. ca. 1112–1145) of the Vukanović dynasty, and Byzantine princess Anna Diogene.[1] Her father had participated in the Byzantine-Hungarian War (1127–29), on the side of King Stephen II of Hungary.[2] The Hungarian Army had destroyed Byzantine Belgrade and penetrated to Naissos (Niš), Serdica (Sofia) and Philippopolis (Plovdiv).

Around 1129, King Stephen II arranged her marriage with his cousin Béla, who had been blinded on the order of the king's father, King Coloman of Hungary (r. 1095–1116). Béla and his father Almos were blinded, so that they will be removed from the line of succession. However, King Stephen was childless and decided to recognise Béla as his successor.[3] Uroš I had prior to this suffered to both Hungary and Byzantium, so he happily befriended the Hungarian king.[4] King Stephen II granted estates near Tolna to the newly wed couple.

Execution of Hungarian nobility in Arad, by Geiger Péter N. János (1805–1880).

Following the childless king's death, her husband was crowned King of Hungary on 28 April 1131. Queen Helena had great influence on her husband, and the Hungarian state.[2] They had six children: Geza, Ladislaus II, Stephen IV, Álmos,[5] Sophia[6] and Gertrud. She was to great help to her husband and governed the state during his rule.[5] She was loyal to her husband and state, and it was she who persuaded the nobles at an assembly in Arad to execute 68 Hungarian aristocrats who had plotted with King Coloman to blind her husband. According to contemporary sources she was attending the execution with her son Bela, in order to secure the death of her husband's enemies.

Serbian Kovin Monastery was founded by Helena

She settled Serbs in Csepel Island, and Ráckeve, where she built a monastery and church which exist still today.[4]

When her husband died on 13 February 1141, their eldest son Géza II was still a child, therefore Helena and her brother Beloš Vukanović governed the Kingdom of Hungary until September 1146 when Géza II came of age. Beloš was Palatine of Hungary, the highest-ranking official, from 1141 to 1161,[4] and Ban of Slavonia from 1146 to 1157. Helena continued to hold great influence on the rule and with the help of her brother Hungary had good relations and peace on its southern borders.[1] In the period of Bela's death, the German-Hungarian relations had been shattered and the engagement of Henric and Sophia, Helena's daughter, was canceled. Sophia took monastic vows and became an abbess at Admont, in Styria.[6]

During the rule of Géza II, Stephen IV and Ladislaus II were not satisfied with their titles and possessions, so they sought help with the Holy Roman Emperors and Byzantine Emperors. The plots against Géza II had no success, and after his death (1161) Manuel I Komnenos saw a good opportunity to expand Byzantine influence in Hungary. Manuel helped to dethrone Stephen III, son of Géza II, and place firstly Ladislaus II and then Stephen IV for a short time. Finally, Stephen III secured the throne in 1163.[7] Queen Helena is believed to have died in 1161.

• István Soltész (1999). Árpád-házi királynék: szentek és szeretők (in Hungarian). Gabo. ISBN 978-963-9237-40-7.CS1 maint: ref=harv (link)
• Gyula Kristó; Ferenc Makk (1996). Az Árpád-ház uralkodói (in Hungarian). I.P.C. Könyvek. ISBN 978-963-7930-97-3.CS1 maint: ref=harv (link)
• Magyar Tudományos Akadémia (1987). Magyarország története: Elozmenyek es Magyar tortenet 1242-IG (in Hungarian). Akadémiai Kiadó.CS1 maint: ref=harv (link)