Robert I, Duke of Burgundy in the context of "Geoffrey II of Gâtinais"

Duke of Burgundy (French: duc de Bourgogne) was a title used by the rulers of the Duchy of Burgundy, from its establishment in 843 to its annexation by the French crown in 1477, and later by members of the House of Habsburg, including Holy Roman Emperors and kings of Spain, who claimed Burgundy proper and ruled the Burgundian Netherlands.

The Duchy of Burgundy was a small portion of the traditional lands of the Burgundians west of the river Saône which, in 843, was allotted to Charles the Bald's kingdom of the West Franks. Under the Ancien Régime, the duke of Burgundy was the premier lay peer of the Kingdom of France. Beginning with Robert II of France (r. 996–1031), the title was held by the Capetians, the French royal family. In 1032 King Henry I of France granted the duchy to his younger brother, Robert, who founded the House of Burgundy. When the senior line of the House of Burgundy became extinct in 1361, the title was inherited by King John II of France through proximity of blood. John granted the duchy to his younger son, Philip the Bold, in 1363. The Valois dukes gradually came to rule over a vast complex of territories known as the Burgundian State, and became dangerous rivals to the senior French royal line of the House of Valois.

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 House of Burgundy (/ˈbɜːrɡəndi/) was a cadet branch of the Capetian dynasty, descending from Robert I, Duke of Burgundy, a younger son of King Robert II of France. The House ruled the Duchy of Burgundy from 1032 to 1361 and achieved the recognized title of King of Portugal.

The last member of the House was Philip of Rouvres, who succeeded his grandfather in 1349. Philip died childless in 1361 and the duchy reverted to his liege, who two years later created his son the new duke of Burgundy, thus beginning the Younger House of Burgundy.