The third chapel on the right hand side of the nave is the Chapel Saint-Jean which dates from the 15th century. In 1855 a marble slab was discovered under layers of whitewash in the wall. The slab has an engraving of a man and a Latin inscription around three sides; the slab is damaged and the inscription on the fourth side is missing. The text reads: "This is the tomb of the noble master professor of both laws, Lord Jordanus Bricius, Lord of the castles of Velaux and Châteauneuf-le-Rouge, who was chief judge of Provence, and had built..." Unfortunately the date which presumably would have been on the fourth side and is missing. Velaux and Châteauneuf-le-Rouge are communes in the department of the Bouches-du-Rhône. The stone is now set into the nearby wall of the church.