Kingdom of Hungary (1301–1526) in the context of "Ottoman Hungary"

Hungary is a landlocked country in Central Europe. Spanning much of the Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and Slovenia to the southwest, and Austria to the west. Hungary lies within the drainage basin of the Danube River and is dominated by great lowland plains. It has a population of 9.6 million, consisting mostly of ethnic Hungarians (Magyars) and a significant Romani minority. Hungarian is the official language, and among the few in Europe outside the Indo-European family. Budapest is the country's capital and largest city, and the dominant cultural and economic centre.

Prior to the foundation of the Hungarian state, various peoples settled in the territory of present-day Hungary, including the Celts, Romans, Huns, Germanic peoples, Avars and Slavs. Hungarian statehood is traced to the Principality of Hungary, which was established in the late ninth century by Álmos and his son Árpád through the conquest of the Carpathian Basin. King Stephen I ascended the throne in 1000 and converted his realm to a Christian kingdom. The medieval Kingdom of Hungary was a European power, reaching its height in the Late Middle Ages.

John Hunyadi (Hungarian: Hunyadi János; Romanian: Ioan de Hunedoara; Croatian: Janko Hunjadi; Serbian: Сибињанин Јанко, romanized: Sibinjanin Janko; Ottoman Turkish: حونیادی یانوش, romanized: Hünyadi Yanoş; c. 1406 – 11 August 1456) was a leading Hungarian military and political figure during the 15th century, who served as regent of the Kingdom of Hungary from 1446 to 1453, under the minor Ladislaus V.

According to most contemporary sources, he was the member of a noble family of Wallachian ancestry. Through his struggles against the Ottoman Empire, he earned for himself the nickname "Turk-buster" from his contemporaries. Due to his merits, he quickly received substantial land grants. By the time of his death, he was the owner of immense land areas, totaling approximately four million cadastral acres, which had no precedent before or after in the Kingdom of Hungary. His enormous wealth and his military and political weight were primarily directed towards the purposes of the Ottoman wars.

Red Ruthenia, also called Red Rus' or Red Russia, is a term used since the Middle Ages for the south-western principalities of Kievan Rus', namely the Principality of Peremyshl and the Principality of Belz. It is closely related to the term Cherven Cities ("Red Cities").

First mentioned by that name in a Polish chronicle of 1321, Red Ruthenia was the portion of Ruthenia incorporated into Poland by Casimir the Great during the 14th century. Following the Mongol invasion of Kievan Rus' in the 13th century, Red Ruthenia was contested by the Grand Duchy of Lithuania (the Gediminids), the Kingdom of Poland (the Piasts), the Kingdom of Hungary and the Kingdom of Galicia–Volhynia. After the Galicia–Volhynia Wars, for about 400 years, most of Red Ruthenia became part of Poland as the Ruthenian Voivodeship.

The siege of Belgrade, or siege of Nándorfehérvár (Hungarian: Nándorfehérvár ostroma or nándorfehérvári diadal, lit. "Triumph of Nándorfehérvár"; Serbian Cyrillic: Опсада Београда, romanized: Opsada Beograda) was a military blockade of Belgrade that occurred 4–22 July 1456 in the aftermath of the fall of Constantinople in 1453 marking the Ottomans' attempts to expand further into Europe. Led by Sultan Mehmed II, the Ottoman forces sought to capture the strategic city of Belgrade (Hungarian: Nándorfehérvár), which was then under Hungarian control and was crucial for maintaining control over the Danube River and the Balkans.

The Hungarian defenders, under the leadership of John Hunyadi, who had garrisoned and strengthened the fortress city at his own expense, put up a determined resistance against the larger Ottoman army. The siege lasted for several weeks, during which both sides suffered heavy losses. The defenders used innovative tactics, including the use of heavy artillery and firearms, to repel the Ottoman assaults. Hunyadi's relief force destroyed a Turkish flotilla on 14 July 1456 before repulsing their large scale assault to capture the city on 21 July. Wounded Mehmed II was compelled to lift the siege and retreat on 22 July 1456. This victory boosted the morale of European Christian forces and was seen as a turning point in their efforts as it provided a crucial buffer and temporarily halted Ottoman expansion in Europe.

Vladislav II (died 20 August 1456) was a voivode of the principality of Wallachia, from 1447 to 1448, and again from 1448 to 1456. The way Vladislav II came to the throne is debatable. The most accepted view is that Vladislav assassinated Vlad II Dracul, ruler of Wallachia, and was subsequently placed on the throne by John Hunyadi, on the other, Vladislav II was helped by the Ottomans to replace Dan III which was assigned by the Hungarians.

After several years of political dispute with his rival Vlad the Impaler over their respective claims to the throne, the two princes agreed to settle the dispute in single combat. At the end of their duel, Vlad killed Vladislav in front of their hosts.

Albert the Magnanimous KG, elected King of the Romans as Albert II (10 August 1397 – 27 October 1439), was a member of the House of Habsburg. By inheritance he became Albert V, Duke of Austria. Through his wife (jure uxoris) he also became King of Hungary, Croatia, Bohemia, and inherited a claim to the Duchy of Luxembourg.

He played a significant role in the Hussite Wars, assisting his father-in-law Sigismund and suffering defeats like the Battle of Domažlice in 1431. Crowned King of Hungary in 1438, he struggled to control Bohemia and fought against Polish-Bohemian forces. He later became King of the Romans but died in 1439 while defending Hungary from the Ottomans. His reign saw anti-Hussite and anti-Jewish persecutions, continuing medieval crusades against perceived heretics. Austrian Jews faced increased taxation and expulsions, culminating in the 1420 Vienna pogrom, partly driven by accusations of aiding the Hussites.

Jan Žižka z Trocnova a Kalicha (English: John Zizka of Trocnov and the Chalice; c. 1360 – 11 October 1424) was a Czech military leader and knight who was a contemporary and follower of Jan Hus, and a prominent Radical Hussite who led the Taborite faction during the Hussite Wars. Renowned for his exceptional military skill, Žižka is celebrated as a Czech national hero. Žižka led the Hussite forces in battles against three crusades and remained undefeated throughout his military career.

Žižka was born in the village of Trocnov, located in the Kingdom of Bohemia, into a family of lower Czech nobility. According to Piccolomini's Historia Bohemica, he maintained connections within the royal court during his youth and later held the office of Chamberlain to Queen Sofia of Bavaria. He fought in the Battle of Grunwald (15 July 1410), where he defended Radzyń against the Teutonic Order. Later, he played a prominent role in the civil wars in Bohemia. He led the Hussites during the first important clashes of the conflict in the Battle of Sudoměř (1420) and in the Battle of Vítkov Hill (1420). In the Battle of Kutná Hora (1421) he defeated the army of the Holy Roman Empire and the Hungarian Kingdom. The effectiveness of his field artillery against the royal cavalry in this battle made it a successful element of Hussite armies.