Certaldo was first Etruscan and later Roman and started to be an important town at the time of the Francigena Route.

It was dominated by Alberti Counts during 13 and 14cent. and developed after the distruction of Semifonte in 1202.

Certaldo is also famous because the poet giovanni Boccaccio was born there in 1313.
In his "Decameron" (IV, 105) he wrote: "Certaldo è un castel posto nel nostro contado, il quale quantunque picciol sia già di nobili uomini a d'agiati fu abitato" ("Certaldo is a castle in our countryside and though it's small,ihabited by noble and wealthy men")