The origins between story and legend
The founding of San Gimignano is lost in the mists of time. It's said that the two brothers Muzio and Silvio, fleeing young Roman patricians, as guilty of the conspiracy against Catilina, in 63 b.C. took shelter in Valdelsa and built there 2 castles: Mucchio's and Silvia's castle, the first name of the future San Gimignano.
The name could also come from the forest that encircled the place, Silva for the latins.....to know more...