Provençal dialect
The first reference to Beaumont (Baùmoun, which means "cave" in Provençal dialect) dates back to 1079, a reference to the cave of Eucherius of Lyon. Before becoming archbishop this hermit went on retreat in a cave overhanging la Durance in the town of Beaumont de Pertuis. Later on, this cave became a pilgrimage site and a chapel was carved inside the mountain.