Free County of Burgundy in the context of "Mary of Burgundy"

The Duchy of Burgundy (/ˈbɜːrɡəndi/; Latin: Ducatus Burgundiae; French: Duché de Bourgogne) was a medieval and early modern feudal polity in north-western regions of historical Burgundy. It was a duchy, ruled by dukes of Burgundy. The Duchy belonged to the Kingdom of France, and was initially bordering the Kingdom of Burgundy to the east and south, thus being distinct from the neighboring Free County of Burgundy (modern region of Franche-Comté). The first duke of Burgundy (Latin: dux Burgundiae), attested in sources by that title, was Richard the Justiciar in 918.

In 1004, prince Henry of France, a son of king Robert II of France, inherited the Duchy, but later ceded it to his younger brother Robert in 1032. Robert became the ancestor of the ducal House of Burgundy, a cadet branch of the royal Capet dynasty, ruling over a territory that roughly conformed to the borders and territories of the modern region of Burgundy (Bourgogne). Upon the extinction of the Burgundian male line with the death of Duke Philip I in 1361, the duchy reverted to King John II of France and the royal House of Valois. The Burgundian duchy was absorbed in a larger territorial complex after 1363, when King John II ceded the duchy to his younger son Philip. With his marriage with Countess Margaret III of Flanders, he laid the foundation for a Burgundian State which expanded further north in the Low Countries collectively known as the Burgundian Netherlands. Upon further acquisitions of the County of Burgundy, Holland, and Luxemburg, the House of Valois-Burgundy came into possession of numerous French and imperial fiefs stretching from the western Alps to the North Sea, in some ways reminiscent of the Middle Frankish realm of Lotharingia.

The Burgundian State (French: État bourguignon [eta buʁɡiɲɔ̃]; Dutch: Bourgondische Rijk [burˈɣɔndisə ˈrɛik]) was a composite monarchy ruled by the Dukes of Burgundy from the late 14th to the late 15th centuries, and which ultimately comprised not only the Duchy and County of Burgundy but also the Burgundian Netherlands. The latter, acquired piecemeal over time and largely through inheritance, was, in fact, their principal source of wealth and prestige. The Dukes were members of the House of Valois-Burgundy, a cadet branch of the French royal House of Valois, and the complex of territories they ruled is sometimes referred to as Valois Burgundy. The term "Burgundian State" was coined by historians and was not in contemporary use; the polity remained a collection of separate duchies and counties in personal union under the Duke of Burgundy.

It is regarded as one of the major powers in Europe of the 15th century. The Dukes of Burgundy were among the wealthiest and the most powerful princes in Europe and were sometimes called "Grand Dukes of the West". Including the thriving regions of Flanders and Brabant, the Burgundian State was a major centre of trade and commerce and a focal point of courtly culture that set the fashion for European royal houses and their courts. It nearly turned into a kingdom in its own right, but Charles the Bold's early death at the Battle of Nancy put an end to his Lotharingian dream and his legacy passed to the House of Habsburg through the marriage of his daughter Mary to Maximilian of Austria. Meanwhile Picardy and the Duchy of Burgundy were conquered by the King of France.

The Burgundian Circle (German: Burgundischer Kreis, Dutch: Bourgondische Kreits, French: Cercle de Bourgogne) was an imperial circle of the Holy Roman Empire created in 1512 and significantly enlarged in 1548. In addition to the Free County of Burgundy (the region of Franche-Comté), the Burgundian Circle roughly covered the Low Countries, i.e., the areas now known as the Netherlands, Belgium and Luxembourg and adjacent parts in the French administrative region of Nord-Pas-de-Calais. For most of its history, its lands were coterminous with the Habsburg Netherlands and the Burgundian Free County (Franche-Comté).

The circle's territorial scope was reduced considerably in the 17th century with the secession of the Seven United Provinces in 1581 (recognized 1648 under the Treaty of Westphalia) and the annexation of the Free County of Burgundy by France in 1678. Consequently, in the 18th century the circle was known as Austrian Netherlands as the Austrian Habsburgs had obtained the territory from Spain earlier in that century. The occupation and subsequent annexation of Imperial territory to the west of the Rhine river by Revolutionary France in the 1790s effectively brought an end to the circle's existence.

Isabella Clara Eugenia (Spanish: Isabel Clara Eugenia; 12 August 1566 – 1 December 1633), sometimes referred to as Clara Isabella Eugenia, was sovereign of the Habsburg Netherlands, and the Free County of Burgundy, from 1598 to 1621, ruling jointly with her husband Archduke Albert VII of Austria. After Albert's death, those regions were returned to the Spanish Habsburgs, and she continued to rule as governess of the Spanish Netherlands until her death.