This 11th century votive chapel is dedicated to the Principality's and Princely family's Patron Saint.
It was built in the hollow of the "Vallon des Gaumates", where during the 4th century a frail boat carrying Sainte Dévote's remains ran aground at its entrance.
Every year on 26th January, a boat is burnt at nightfall as part of a still fervent traditional ceremony.
Free admission