The square is a reference point for the new western quarter of the city. The expansion of this area dates from the late medieval period to its completion during the 16th and 17th centuries. This is a working-class neighbourhood where farmers, artisans and labourers lived. Hence improvements to the water system were necessary and were realized through the construction of a large cistern.
The structure beneath the square may be dated to the 17th century and collected rainwater, fed through a system of channels and drains. The cistern is completely coated with an impermeable plaster, according to an ancient and effective technique.