Géza II of Hungary in the context of "Stephen III of Hungary"

Béla III (Hungarian: III. Béla, Croatian: Bela III., Slovak: Belo III.; c. 1148 – 23 April 1196) was King of Hungary and Croatia between 1172 and 1196. He was the second son of King Géza II and Géza's wife, Euphrosyne of Kiev. Around 1161, Géza granted Béla a duchy, which included Croatia, central Dalmatia and possibly Sirmium. In accordance with a peace treaty between his elder brother, Stephen III, who succeeded their father in 1162, and the Byzantine Emperor Manuel I Komnenos, Béla moved to Constantinople in 1163. He was renamed to Alexios, and the emperor granted him the newly created senior court title of despotes. He was betrothed to the Emperor's daughter, Maria. Béla's patrimony caused armed conflicts between the Byzantine Empire and the Kingdom of Hungary between 1164 and 1167, because Stephen III attempted to hinder the Byzantines from taking control of Croatia, Dalmatia and Sirmium. Béla-Alexios, who was designated as Emperor Manuel's heir in 1165, took part in three Byzantine campaigns against Hungary. His betrothal to the emperor's daughter was dissolved after her brother, Alexios, was born in 1169. The emperor deprived Béla of his high title, granting him the inferior rank of kaisar.

Stephen III died on 4 March 1172, and Béla decided to return to Hungary. Before his departure, he pledged that he would never make war against the Byzantine Empire. Although the Hungarian prelates and lords unanimously proclaimed Béla king, Lucas, Archbishop of Esztergom opposed his coronation because of Béla's alleged simony. Finally, the Archbishop of Kalocsa crowned him king on 18 January 1173, with Pope Alexander III's approval. Béla fought with his younger brother, Géza, whom he held in captivity for more than a decade. Taking advantage of the internal conflicts in the Byzantine Empire after Emperor Manuel's death, Béla reoccupied Croatia, Dalmatia and Sirmium between 1180 and 1181. He occupied the Principality of Halych in 1188, but it was lost within two years.

Euphrosyne of Kiev (also Euphrosine of Novgorod; Hungarian: Eufrozina; c. 1130 – c. 1193) was Queen consort of Hungary by marriage to King Géza II of Hungary.

Lucas (Hungarian: Lukács; c. 1120 – 1181), also known as Luke, was a Hungarian prelate and diplomat in the 12th century. He was Bishop of Eger between 1156 and 1158, and Archbishop of Esztergom from 1158 until his death in 1181.

Lucas is believed to have come from a wealthy and influential family, but sources are uncertain of his origin. He was one of the first students of the University of Paris. When he returned to Hungary, his ecclesiastical career ascended quickly into the highest dignities. As a confidant of Géza II in his last years, Lucas had a significant impact on the country's foreign policy and diplomatic processes. Lucas was a staunch supporter of Stephen III during the struggles in the Árpád dynasty following Géza II's death, where Stephen III's reign was contested by his two uncles. The archbishop opposed both the intervention efforts of the Byzantine Empire and the Holy Roman Empire. Lucas had an ambivalent relationship with Stephen's brother and successor Béla III. The strict and uncompromising nature of his extremist Gregorianism challenged and weakened his partnership and alliance with the Holy See in the last decade of his archiepiscopal tenure, which coincided with the pontificate of Pope Alexander III.

Géza (c. 1151 – after 1191) was the youngest son of King Géza II of Hungary. He was the younger brother of Stephen III and Béla III of Hungary. Géza was a pretender to the Hungarian throne against Béla III, but he was imprisoned from 1177 to 1189. He traveled to the Holy Land during the Third Crusade with an army of 2,000 Hungarian warriors.

Louis VII (1120 – 18 September 1180), called the Younger or the Young (French: le Jeune) to differentiate him from his father Louis VI, was King of France from 1137 to 1180. His first marriage was to Duchess Eleanor of Aquitaine, one of the wealthiest and most powerful women in western Europe. The marriage temporarily extended the Capetian lands to the Pyrenees.

Louis was the second son of Louis VI of France and Adelaide of Maurienne, and was initially prepared for a career in the Church. Following the death of his older brother, Philip, in 1131, Louis became heir apparent to the French throne and was crowned as his father's co-ruler. In 1137, he married Eleanor of Aquitaine and shortly thereafter became sole king following his father's death. During his march, as part of the Second Crusade in 1147, Louis stayed at the court of King Géza II of Hungary on the way to Jerusalem. During his stay in the Holy Land, disagreements with Eleanor led to a deterioration in their marriage. She persuaded him to stay in Antioch but Louis instead wanted to fulfil his vows of pilgrimage to Jerusalem. He was later involved in the failed siege of Damascus and eventually returned to France in 1149. Louis' reign saw the founding of the University of Paris. He and his counsellor, Abbot Suger, pushed for greater centralisation of the state and favoured the development of French Gothic architecture, notably the construction of Notre-Dame de Paris.

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.