book 1, part 2, chapter 1-4.

Hugh-le-Grand died in 956. "His power, which, more than his talents or exploits, had given him the name of Great, was divided between his children, who were yet very young. ... There is some doubt as to their number and the order of their birth. It appears, however, that Otho was the eldest of his three sons. He had given him his part of the duchy of Burgundy, and had made him marry the daughter and heir of Gislebert, duke of another part of Burgundy, to which Otho succeeded the same year. The latter dying in 963 or 965, the duchy of Burgundy passed to his third brother, sometimes named Henry, sometimes Eudes. Hugues [Hugh], surnamed Capet, who succeeded to the county of Paris and the duchy of France, was but the second son."

_J. C. L. de Sismondi, The French under the Carlovingians, chapter 15._

In 987 Hugh Capet became king of France and founded the lasting dynasty which bears his name. His elder brother Henry remained Duke of Burgundy until his death, in 1002, when his royal nephew, Robert, son and successor of Hugh, annexed the Duchy to the Crown. It so remained until 1032. Then King Henry I., son of Robert, granted it as an appanage to his brother Robert, who founded the first Capetian House of Burgundy.

_E. de Bonnechose, History of France,