Richard III (997 - 1027) was the eldest son of Richard II, who died in 1027. Before succeeding his father, perhaps about 1020, he had been sent by his father in command of a large army, to attack bishop/count Hugh of Chalon in order to rescue his brother-in-law, Reginald, later Count of Burgundy, who the count/bishop had captured and imprisoned. He was betrothed to Adela, countess of Corbie (1009- 5 June 1063), second daughter of Robert II of France and Constance of Arles, but they never married. After his father's death, he ruled the Duchy of Normandy only briefly, dying mysteriously, perhaps by poison, soon after his father. The duchy passed to his younger brother Robert I. Adela later married Baldwin V, Count of Flanders.

- http://en.wikipedia.org/wiki/Richard_III,_Duke_of_Normandy