Ottoman Hungary in the context of "Great Turkish War"

Suleiman I (Ottoman Turkish: سلیمان اول, romanized: Süleymân-ı Evvel; Modern Turkish: I. Süleyman, IPA: [biɾinˈdʒi sylejˈman]; 6 November 1494 – 6 September 1566), commonly known as Suleiman the Magnificent in the Western world and as Suleiman the Lawgiver (قانونی سلطان سلیمان, Ḳânûnî Sulṭân Süleymân) in his own realm, was the Ottoman sultan between 1520 and his death in 1566. Under his administration, the Ottoman Empire ruled over at least 25 million people.

After succeeding his father Selim I on 30 September 1520, Suleiman began his reign by launching military campaigns against the Christian powers of Central and Eastern Europe and the Mediterranean; Belgrade fell to him in 1521 and Rhodes in 1522–1523, and at Mohács in 1526, Suleiman broke the strength of the Kingdom of Hungary. Hungary was subsequently divided, with much of it incorporated directly into the empire. However, his defeat at the siege of Vienna in 1529 checked advances further into Europe.

The Siege and Battle of Vienna took place at Kahlenberg Mountain near Vienna on 12 September 1683 after the city had been besieged by the Ottoman Empire for two months. The battle was fought by the Holy Roman Empire (led by the Habsburg monarchy) and the Polish–Lithuanian Commonwealth, both under the command of Polish King John III Sobieski, against the Ottomans and their vassal and tributary states. The battle marked the first time the Commonwealth and the Holy Roman Empire had cooperated militarily against the Ottomans. The defeat was a turning point for Ottoman expansion into Europe, after which they would gain no further ground. In the ensuing war that lasted until 1699, the Ottomans would cede most of Ottoman Hungary to Leopold I, Holy Roman Emperor.

The battle was won by the combined forces of the Holy Roman Empire and the Polish–Lithuanian Commonwealth, the latter represented only by the forces of the Crown of the Kingdom of Poland (the march of the Lithuanian army was delayed, and they reached Vienna after it had been relieved). The Viennese garrison was led by Feldzeugmeister of the Holy Roman Imperial Army Ernst Rüdiger Graf von Starhemberg, an Austrian subject of Holy Roman Emperor Leopold I. The overall command was held by the senior leader, the King of Poland, John III Sobieski, who led the relief forces.

The Kingdom of Hungary was a monarchy in Central Europe that existed for nearly a millennium, from 1000 to 1946. The Catholic kingdom emerged as a continuation of the Grand Principality of Hungary upon the coronation of the first king Stephen I at Esztergom around the year 1000; his family (the Árpád dynasty) led the monarchy for 300 years. By the 12th century, the kingdom had become a European power.

Due to the Ottoman occupation of the central and southern territories of Hungary in the 16th century, the country was partitioned into three parts: the Habsburg Royal Hungary, Ottoman Hungary, and the semi-independent Principality of Transylvania. The House of Habsburg held the Hungarian throne after the Battle of Mohács in 1526 continuously until 1918 and also played a key role in the wars against the Ottoman Empire and the eventual expulsion of the Turks during and after the Great Turkish War.

The Battle of Mohács (Hungarian: [ˈmohaːt͡ʃ]; Hungarian: mohácsi csata, Turkish: Mohaç Muharebesi) took place on 29 August 1526 near Mohács, in the Kingdom of Hungary. It was fought between the forces of Hungary, led by King Louis II, and the invading Ottoman Empire, commanded by Suleiman the Magnificent and his grand vizier, Pargalı Ibrahim Pasha. The Ottomans achieved a decisive victory through superior planning, firepower, and a well-executed encirclement that overwhelmed the Hungarian forces.

The Hungarian army, encouraged by the nobility to engage prematurely, launched a frontal assault that collapsed under coordinated Ottoman counterattacks. King Louis and much of the Hungarian aristocracy were killed, resulting in the destruction of the royal army and the end of the Jagiellonian dynasty in Hungary and Bohemia. The aftermath saw the partition of Hungary between the Ottoman Empire, the Habsburg monarchy, and the Eastern Hungarian Kingdom in 1541.

John Zápolya or Szapolyai (Hungarian: Szapolyai/ Zápolya János; Croatian: Ivan Zapolja; Romanian: Ioan Zápolya; Slovak: Ján Zápoľský; 1487 – 22 July 1540), was King of Hungary (as John I) from 1526 to 1540. His rule was disputed by Archduke Ferdinand I, who also claimed the title King of Hungary. He was Voivode of Transylvania before his coronation, from 1510 to 1526.

John came from a prominent Croatian-Slavonian noble family. His father became one of Hungary's wealthiest lords and served as Palatine of Hungary. During the Peasants' Revolt of 1514 led by György Dózsa, John gained influence through his military campaigns and by crushing the revolt, which bolstered his authority and earned him the title of "liberator of the realm." However, his power declined after his sister Barbara's death in 1515. And in 1528, he fled to Poland, later aligning with the Ottomans, leading Hungary to become an Ottoman vassal state.

Louis II (Hungarian: II. Lajos; Czech: Ludvík Jagellonský; Croatian: Ludovik II.; Slovak: Ľudovít II.; 1 July 1506 – 29 August 1526) was King of Hungary, Croatia and Bohemia from 1516 to 1526. He died during the Battle of Mohács fighting the Ottomans, whose victory led to the Ottoman annexation of large parts of Hungary.

The siege of Buda (4 May – 21 August 1541) ended with the capture of the city of Buda, the historical capital of the Kingdom of Hungary, by the Ottoman Empire, leading to about 150 years of Ottoman rule in parts of Hungary. The siege, part of the Little War in Hungary, was one of the most important Ottoman victories over the Habsburg monarchy during Ottoman–Habsburg wars (16th to 18th century) in Hungary and the Balkans.