Maximilian II, Holy Roman Emperor in the context of "Barbara Flaminia"

The Kingdom of Hungary between 1526 and 1867 existed as a state outside the Holy Roman Empire, but part of the lands of the Habsburg monarchy that became the Austrian Empire in 1804. After the Battle of Mohács in 1526, the country was ruled by two crowned kings (John I and Ferdinand I). Initially, the exact territory under Habsburg rule was disputed because both rulers claimed the whole kingdom. This unsettled period lasted until 1570 when John Sigismund Zápolya (John II) abdicated as King of Hungary in Emperor Maximilian II's favor.

In the early stages, the lands that were ruled by the Habsburg Hungarian kings were regarded as both the "Kingdom of Hungary" and "Royal Hungary". Royal Hungary was the symbol of the continuity of formal law after the Ottoman occupation, because it could preserve its legal traditions, but in general, it was de facto a Habsburg province. The Hungarian nobility forced Vienna to admit that Hungary was a special unit of the Habsburg lands and had to be ruled in conformity with its own special laws. However, Hungarian historiography positioned Transylvania in a direct continuity with the medieval Kingdom of Hungary in pursuance of the advancement of Hungarian interests.

The Eastern Hungarian Kingdom (Hungarian: keleti Magyar Királyság [ˈkɛlɛti ˈmɒɟɒr ˈkiraːjʃaːg]) is a modern term coined by some historians to designate the realm of John Zápolya and his son John Sigismund Zápolya, who contested the claims of the House of Habsburg to rule the Kingdom of Hungary from 1526 to 1570. The Zápolyas ruled over an eastern part of Hungary, and the Habsburg kings (Ferdinand and Maximilian) ruled the west. The Habsburgs tried several times to unite all Hungary under their rule, but the Ottoman Empire prevented that by supporting the Eastern Hungarian Kingdom.

The exact extent of the Zápolya realm was never settled because both the Habsburgs and the Zápolyas claimed the whole kingdom. A temporary territorial division was made in the Treaty of Nagyvárad in 1538. The Eastern Hungarian Kingdom is considered the predecessor of the Principality of Transylvania (1570–1711), which was established by the Treaty of Speyer.

The Seasons or The Four Seasons is a set of four paintings produced in 1563, 1572 and 1573 by the Italian artist Giuseppe Arcimboldo. He offered the set to Maximilian II, Holy Roman Emperor in 1569, accompanying The Four Elements. Each shows a profile portrait made up of fruit, vegetables and plants relating to the relevant season. The set was accompanied by a poem by Giovanni Battista Fonteo (1546–1580) explaining their allegorical meaning.

Only Winter and Summer survive from the original work – these are now in the Kunsthistorisches Museum in Vienna. The Louvre has a full set of the copies made by the painter for Maximilian to send to Augustus of Saxony – these have a floral frame not used in the original version. Spring also survives from a set copied for Philip II of Spain – it is now in the Real Academia de San Fernando in Madrid.

The Treaty of Speyer, signed at the Diet of Speyer in 1570, was a peace agreement between the two Hungarian Kingdoms, Royal Hungary led by Maximilian II, and the Eastern Hungarian Kingdom, ruled by John Sigismund Zápolya, which lead to the establishment of the Principality of Transylvania.

The Four Elements is a series of four oil paintings by the Italian artist Giuseppe Arcimboldo which were created in 1566, during the Renaissance, for Maximilian II, Holy Roman Emperor. The paintings depict human faces in profile made up from different animals or objects. Air is represented by birds, Fire by burning wood and cannons, Earth by land animals and Water by marine creatures. The series attempts to express the creation of harmony from chaos by the careful arrangement of the wild animals to form portraits whilst also praising Maximilian by suggesting that he is a ruler who controls even the four primal elements.

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  Air, ca. 1566, (copy), private collection
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  Fire, Oil on Wood, 1566, Kunsthistorisches Museum Vienna
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  Earth, possibly 1566, private collection, Austria
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  Water, 1566, Kunsthistorisches Museum Vienna