Siena was almost certainly an Etruscan city and then Roman, as one can gather from its symbols: the female wolf that nurses the twins Romulus and Remus and the black and white blaze.

According to legend the founding fathers of Siena were Senio and Ascanio, the sons of Remus, who, having escaped from their uncle Romulus, constructed Castle Senio.

They took with them the statue of the female wolf that they stole from the temple of Apollo in Rome.

On founding the castle at Siena they chose the colours for their standard: black for Ascanio, white for Senio.