Fontebranda is the oldest
in Siena and is also mentioned by Dante in the Divine Comedy (Hell XXX, verses 76-78).
Externally, the spring has three large Gothic pointed arches above which there are battlements, while inside there is the tank that contains the water. The water was supplied by the bottini underground channels and the spring originally had three basins: the first was for drinking water, the second was used as a drinking trough for animals and the third as a wash house.
A few metres away, there is the Porta di Fontebranda, along the road that leads to the valley floor. It was built around 1257 and was equipped with a tower and a ravelin. Today it looks like a simple opening in the city walls over which there is a double arch.