 Beginning in 1628, the side chapels were decorated with iron gates and carved wood panelling, and the Florentine sculptor Francesco Bordoni began work on the marble altar.The figure to the left depicts Charlemagne, with the features of Henry II, while the figure on the right depicts Louis IX, or Saint Louis, with the features of Louis XIII, his patron.Bordoni also designed the multicolored marble pavement before the altar and the on the walls of the nave.