Bertrand IV des Baux, Prince of Orange

Bertrand IV des Baux (c. 1240–1314) succeeded his father Raymond I as Prince of Orange in 1282. In 1288 he bought his cousin Bertrand III's share of the principality, becoming sole prince, and a charter of 1293 made Orange impartible, to pass to a single heir.

In 1309 he obtained Charles II of Naples's half of Orange by accepting vassalage to the counts of Provence. He fathered his successor Raymond IV and died in 1314.