On this square used to be plant a beautiful nettle tree, about 6 metres high. It was cut down because it had a rotten trunk.
The place des Quatre-Dauphins ("4 dolphins' square") dates back to 1667, laid out, with the Mazarin district, by bishop of Aix Michel Mazarin. Valois and Boisgelin's city houses façades nicely frame the little square, in middle of Aix city.
Hey, what about the fountain? It was raised in 1667, made by sculptor Jean-Claude Rambot, from Franche-Comté, Eastern France. A legend says that 2 pipes used to pour cold water and 2 others hot water... a mineral hot water that fed Sextius thermae: because Aix city was called Aquae Sextiae, "Sextius' waters", from the Roman consul Sextius who set the trend of the thermal springs here. These very hot water were useful for some illness. Romans knew it well and they came in Aix for that since centuries!