Founded in 122 BC by the Roman garrison of Caius Sextius Calvinus, Aix-en-Provence was first called Aquae Sextiae before becoming Aquis in Provincia in the middle of the 13th century, then Aix, and finally Aix-en-Provence from 1932 by decree of President Paul Doumer. The first element of its name, Aix, comes from the Latin aqua (water) and its plural locative ablative Aquis (to waters) derived in Ais in Provençal and Aix in French. This toponymic type, frequent in France, most often designates thermal waters and therefore refers to the city's thermal baths, the yellow building visible in the center-left of this aerial shot. Its second Latin element, Sextiae, referred to Caius Sextius Calvinus, the founder of Aix-en-Provence.