stylistic:tone, linguistic:translation, quality:corruption
High Middle Ages

The principality was succeeded by the Christian Kingdom of Hungary with the coronation of St Stephen I (son of principal Géza. Originally called Vajk until baptized) at Esztergom on Christmas Day 1000. The first kings of the kingdom were from the Árpád dynasty. He fought against Koppány and in 998, with Bavarian help, defeated him near Veszprém. The Catholic Church received powerful support from Stephen I, who with Christian Hungarians and German knights wanted a Christian kingdom established in Central Europe. Stephen I of Hungary was canonized as a Catholic saint in 1083 and an Eastern Orthodox saint in 2000.Around the 11th century, the Kingdom of Hungary became a Christian state, and Catholicism in the Hungarian Kingdom was a state religion.

After his death, a period of revolts and conflict for supremacy ensued between the royalty and the nobles. In 1051 armies of the Holy Roman Empire tried to conquer Hungary, but they were defeated at Vértes Mountain. The armies of the Holy Roman Empire continued to suffer defeats; the second greatest battle was at the town now called Bratislava, in 1052. Before 1052 Peter Orseolo, a supporter of the Holy Roman Empire, was overthrown by king Samuel Aba of Hungary.

This period of revolts ended during the reign of Béla I. Hungarian chroniclers praised Béla I for introducing new currency, such as the silver denarius, and for his benevolence to the former followers of his nephew, Solomon. The second greatest Hungarian king, also from the Árpád dynasty, was Ladislaus I of Hungary, who stabilized and strengthened the kingdom. He was also canonized as a saint. Under his rule Hungarians successfully fought against the Cumans and acquired parts of Croatia in 1091. Due to a dynastic crisis in Croatia, with the help of the local nobility who supported his claim, he managed to swiftly seize power in northern parts of the Croatian kingdom (Slavonia), as he was a claimant to the throne due to the fact that his sister was married to the late Croatian king Zvonimir who died without an heir.

However, kingship over all of Croatia would not be achieved until the reign of his successor Coloman. With the coronation of King Coloman as " King of Croatia and Dalmatia " in Biograd in 1102, the two kingdoms of Croatia and Hungary were united under one crown. Although the precise terms of this relationship became a matter of dispute in the 19th century, it is believed that Coloman created a kind of personal union between the two kingdoms. The nature of the relationship varied through time, Croatia retained a large degree of internal autonomy overall, while the real power rested in the hands of the local nobility. Modern Croatian and Hungarian historiographies mostly view the relations between Kingdom of Croatia (1102–1526) and Kingdom of Hungary from 1102 as a form of a personal union, i.e. that they were connected by a common king. Also, one of the greatest Hungarian jurists and statesmen of the 16th century, István Werbőczy in his work Tripartitum treats Croatia as a kingdom separate to Hungary.

Especially Arabic and Byzantine travelers from this time praised the richness country, the dense pastures, the nicely cultivated lands, the plentiful animals in waters and forests. They said that the wheat is cheap, the markets are populous, the cities flourish and the folk are wealthy. Although it is hardly credible that they refer to all layers of society, the documents were inspired by the reality.

In 1222 Andrew II of Hungary issued the Golden Bull which laid down the principles of law.