Béla II of Hungary in the context of "Split, Croatia"

The high medieval Kingdom of Hungary was a regional power in central Europe. It came into existence in Central Europe when Stephen I, Grand Prince of the Hungarians, was crowned king in 1000 or 1001. He reinforced central authority and forced his subjects to accept Christianity. Although all written sources emphasize only the role played by German and Italian knights and clerics in the process, a significant part of the Hungarian vocabulary for agriculture and religion was taken from Slavic languages. Civil wars and pagan uprisings, along with attempts by the Holy Roman emperors to expand their authority over Hungary, jeopardized the new monarchy. The monarchy stabilized during the reigns of Ladislaus I (1077–1095) and Coloman (1095–1116). These rulers occupied Croatia and Dalmatia with the support of a part of the local population. Both realms retained their autonomous position. The successors of Ladislaus and Coloman—especially Béla II (1131–1141), Béla III (1176–1196), Andrew II (1205–1235), and Béla IV (1235–1270)—continued this policy of expansion towards the Balkan Peninsula and the lands east of the Carpathian Mountains, transforming their kingdom into one of the major powers of medieval Europe.

Rich in uncultivated lands, silver, gold, and salt deposits, Hungary became the preferred destination of mainly German, Italian, and French colonists. These immigrants were mostly peasants who settled in villages, but some were craftsmen and merchants, who established most of the cities of the Kingdom. Their arrival played a key role in the shaping of an urban lifestyle, habits, and culture in medieval Hungary. The location of the kingdom at the crossroads of international trade routes favored the coexistence of several cultures. Romanesque, Gothic, and Renaissance buildings and literary works written in Latin prove the predominantly Roman Catholic character of the culture; but Orthodox, and even non-Christian ethnic minority communities also existed. Latin was the language of legislation, administration and the judiciary, but "linguistic pluralism" contributed to the survival of many tongues, including a great variety of Slavic dialects.

Bosnia and Herzegovina is a country in Southeast Europe on the Balkan Peninsula. It has had permanent settlement since the Neolithic Age. By the early historical period it was inhabited by Illyrians and Celts. Christianity arrived in the 1st century, and by the 4th century the area became part of the Western Roman Empire. Germanic tribes invaded soon after, followed by Slavs in the 6th century.

In 1136, Béla II of Hungary asserted control over Bosnia and created the title "Ban of Bosnia" as an honorary title for his son Ladislaus II of Hungary. During this time, Bosnia became virtually autonomous, and was eventually proclaimed a kingdom in 1377. In 1463, Bosnia was annexed into the Ottoman Empire, marking the beginning of more than 400 years of Ottoman rule in the region. They wrought great changes to the political and administrative system, introduced land reforms, and class and religious distinctions. A series of uprisings began in 1831, which culminated in the Herzegovinian rebellion, a widespread peasant uprising, in 1875. The conflict eventually forced the Ottomans to cede administration of the country to the Habsburg monarchy through the Treaty of Berlin in 1878.

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.

Stephen IV (Hungarian: IV. István, Croatian: Stjepan IV, Slovak: Štefan IV; c. 1133 – 11 April 1165) was King of Hungary and Croatia, ascending to the throne between 1163 and 1165, when he usurped the crown of his nephew, Stephen III. He was the third son of Béla II of Hungary, and when his conspiracy against his brother Géza II failed, he was exiled from Hungary in the summer of 1157. He first sought refuge in the Holy Roman Empire, but received no support from Emperor Frederick I. Shortly afterwards he moved to the Byzantine Empire, where he married a niece of Emperor Manuel I Komnenos, Maria Komnene, and converted to the Eastern Orthodox Church.

After Géza II died on 31 May 1162, Emperor Manuel attempted to assist Stephen against his nephew and namesake, Stephen III, in seizing the crown. Although the Hungarian lords were willing to leave their young monarch, they sharply opposed Stephen and elected his brother, Ladislaus II, king. Ladislaus II granted the ducatus, or duchy, which included one-third of the kingdom, to Stephen. Ladislaus II died on 14 January 1163, and Stephen succeeded him. Lucas, Archbishop of Esztergom, who remained a staunch supporter of the expelled young Stephen III, denied to crown him and excommunicated him. Stephen IV remained unpopular among the Hungarian lords, enabling his nephew to muster an army. In the decisive battle, which was fought at Székesfehérvár on 19 June 1163, the younger Stephen routed his uncle, forcing him once again to flee Hungary.