_At the left-hand corner_, facing the Temple of Castor, the oval basin
of this fountain has been cleared, and the spring which supplied it is
covered with an iron grating, and has been turned into the Cloaca. It
is no doubt the same at which the twin-gods, Castor and Pollux, washed
their horses after fighting for Rome in the battle of Lake Regillus,
when they announced to the people that the battle was won. Similar
stories are told by Florus. When the Romans conquered Perses, king of
Macedonia, the twin-gods washed themselves at the Lake of Juturna; and
when they defeated the Tigurini, the gods were seen to deliver a
letter to the prætor in front of their temple.
Juturna was the sister of Turnus, immortalized by Jupiter, and turned
into a fountain, whose waters were used in Vesta's sacrifices, and had
curative powers.