A symbol of the romanisation of Martigues, it expresses the integration of the local elite in a new political and social system.
The northern façade of the Chapelle de Saint Julien features a stone bas-relief of La Couronne which probably belonged to a monumental mausoleum. It represents a familiar funeral scene with a couple in the centre with two small children surrounded by two figures wearing gowns and two soldiers.
Built during the first century AD, it is linked to the creation of a villa lower on the plain. The building is a tribute to the first master and founder of the residential and farming estate of Saint Julien.