The alliance of the seven Hungarian tribes took possession of the then largely uninhabited Carpathian Basin. Until then, the sparse Slavic population of the north-western Carpathians had lived under Moravian rule for a few decades after the collapse of the Avar Khaganate in the early 9th century.

The Kingdom of Hungary was established with the coronation of King Stephen I. He converted the Hungarians to Christianity and created two archdioceses (Esztergom and Kalocsa) and ten dioceses. He divided Hungary into counties led by ispáns, who were appointed by the king.

The hordes of the Mongol Empire invaded Hungary and almost completely destroyed it. One third to one half of the population was destroyed. The Mongols also suffered heavy losses in the battle of Muhi and they could not hunt down the king. After their withdrawal, King Béla IV reorganized Hungary. He allowed the feudal lords to build stone castles because they were able to successfully resist the nomadic Mongols. The vast majority of stone castles were built after this. The king called in German, Vlach (Romanian) and Slavic settlers to replace the destroyed population.

The House of Árpád, the first Hungarian royal dynasty, died out with the death of King Andrew III. Hungary was ruled by oligarchs, the most powerful of whom was Csák Máté, whose main ally was the Aba family. King Charles I (1308-1342), supported by the Pope, eventually emerged as the most prominent of the contenders for the Hungarian throne. But it took decades to break the power of the oligarchs.

Sultan Suleiman I launched a war against Vienna, instigated by the French. Ferdinand I, Duke of Austria, was the brother-in-law of King Louis II of Hungary. The army of the Ottoman Empire defeated the much smaller Hungarian army at Mohács, and King Louis II died in the battle. A group of the barons elected Ferdinand I of the House of Habsburg to the throne, who promised to defend Hungary from the Turks. He was the younger brother of the most powerful European monarch Emperor Charles V. But the nobility chose the most powerful Hungarian baron, Szapolyai János, who was also crowned as King John I. The country was split in two and a decades-long struggle for power began.

The Turks conquered Buda, the capital of Hungary, after the death of King John I. The central part of the country was under Turkish rule for 150 years. The western and northern parts (including present-day Slovakia) formed the Kingdom of Hungary ruled by the Habsburg emperors. The eastern parts (now mainly under Romanian rule) were ruled by the successors of King John I of Hungary, who later established the Principality of Transylvania.

John II (John Sigismund), the son of King John I of Hungary, renounced the title of King of Hungary in favor of King Maximilian of the House of Habsburg, and henceforth held the title of Prince. This formally created the Principality of Transylvania, which was the eastern half of Hungary not ruled by the Habsburgs and was also a vassal of the Ottoman Empire. John II died in 1571, after which the three nations of Transylvania (the Hungarian nobility, the Székelys and the Saxons) elected the prince.

The alliance of the Habsburgs and the Principality of Transylvania was defeated by the Ottoman Empire in the Fifteen Years' War. The war devastated Transylvania, which was occupied by the Habsburg imperial army, and General Basta introduced a reign of terror. The nobility and the burghers were upset about the terror, the plundering mercenaries and the violent Counter-Reformation. Bocskai István decided to lead their uprising after the Habsburg emperor tried to confiscate his estates. Bocskai also rallied the hajdú warriors to his side. He was elected Prince of Transylvania and soon liberated the Kingdom of Hungary from the Habsburgs. In 1605 Bocskai István was crowned King of Hungary with the crown he received from the Turks.

Bocski István made peace with Emperor Rudolf. Their agreement secured the constitutional rights of the Estates of Hungary, and the freedom of religion. The counties of Szatmár, Bereg and Ugocsa were annexed to the Principality of Transylvania. Bocskai died of illness in the same year, leaving to his successors the idea of unifying Hungary from Transylvania.

Prince Rákóczi György I of Transylvania allied with the Swedes and the French in the Thirty Years' War and went to war against the Habsburg Emperor Ferdinand III. On 18 July 1645 his army joined forces with Torstenson's Swedish army under Brno (Moravia). The excellent artillery of Transylvania opened fire on the city walls. However, Rákóczi had to give up the siege, having been informed that the Turks were planning a punitive campaign against Transylvania, because he went to war against the Sultan's prohibition.

Prince Rákóczi György I of Transylvania made peace with Emperor Ferdinand III. It secured the freedom of religion for the Protestants and extended it also to the serfs. Rákóczi received the same seven Hungarian counties that Prince Bethlen Gábor had also held (Abauj, Zemplén, Borsod, Bereg, Ugocsa, Szabolcs, Szatmár) until his death, and the counties of Szabolcs and Szatmár were also to be inherited by his sons. The Rákóczi family also received several new estates.

The army of the Holy League recaptured Buda from the Turks by siege. In 1687, the Imperial army invaded the Principality of Transylvania. The liberation was hindered by the French breaking their promise of peace in 1688 and attacking the Habsburg Empire. By 1699, when the Peace of Karlóca was signed, all of Hungary and Croatia had been liberated from the Ottoman Empire with the exception of Temesköz, the area bounded by the Maros, the Tisza and the Danube rivers. It was not until the Peace of Požarevac in 1718 that Temesköz was liberated from the Turks. However, the continuous war against the Turkish invaders and the Habsburg autocracy, which lasted for more than 150 years, wiped out large areas of the Hungarian population, which had previously made up 80% of the country's population, and was replaced by Vlachs (Romanians), Serbs and other Slavic settlers and Germans. The Habsburgs also favoured the settlement of these foreign peoples over the 'rebellious' Hungarians.

After the expulsion of the Turks, the Habsburgs treated Hungary as a newly conquered province and did not respect its constitution. The serfs rose up against the Habsburg ruler because of the sufferings caused by the war and the heavy burdens, and they invited Rákóczi Ferenc II to lead them. Trusting in the help promised by King Louis XIV of France, he accepted. Rákóczi rallied the nobility to his side, and soon most of the country was under his control. The rebels were called the kurucs. In 1704, the French and the Bavarians were defeated at the Battle of Blenheim, depriving the Hungarians of their international allies. The Rusyn, Slovak and Vlach peasants and the Saxons of Szepes supported the fight for freedom, while the Serbs in the south and the Saxons in Transylvania served the Habsburgs. Due to lack of funds Rákóczi could not raise a strong regular army, and in 1710, Hungary was also hit by a severe plague. Rákóczi tried unsuccessfully to forge an alliance with Tsar Peter the Great of Russia. In his absence, without his knowledge, his commander-in-chief, Károlyi Sándor, accepted Emperor Joseph I's peace offer. The Peace of Szatmár formally restored the Hungarian constitution and religious freedom and granted amnesty, but did not ease the burden of serfdom. Rákóczi refused to accept the pardon and went into exile. He died in Rodosto, Turkey.