Bertrand I of Baux

Bertrand I of Baux (c. 1137–1181) was a younger son of Raymond of Baux. During his family's wars with the house of Barcelona, he helped the young Alfonso II of Aragon escape to Arles, helping reconcile the families.

In 1173 he married Thiburge II, heiress of Orange, and in 1175 began building the abbey church of Silvacane. In 1178 Emperor Frederick Barbarossa granted him at Arles the right to style himself Prince of Orange and to wear a closed crown.

On Easter Day 1181 he was killed in an ambush while marching on Montpellier, reportedly on Count Raymond V of Toulouse's orders, and was buried at Silvacane.