Casciana Terme Lari is a widespread municipality, established on 1 January 2014 with the merger of the villages of Casciana Terme and Lari.
Casciana Terme (Castrum at Aquas or Balneum at Aquas in Latin), up to 1927 fraction of Lari, had already called the water bath and the Baths of Casciana. Its history is closely tied to the therapeutic properties of the water flowing in giving life to the Terme. The origins of Casciana date back to the Etruscan period as from recent archaeological finds in the area of the Parlascio. The written pleadings the oldest, dating back to the IX century and attest to the existence of the parish church of Santa Maria ad Acquas, in a document of the archive of the Bishop of Lucca. In the XII century Casciana (Aqui) was the seat of a castle with towers and walls, located in the core of Petraia where is still visible today a beautiful medieval tower, the Tower Aquisana. The toponym Casciana derives from the latin name of person Cassius, with the meaning then "land of Cassio".
The Village of Lari instead preserves numerous remains of its illustrious past when it was in fact the main town of the Pisan Hills. In antiquity it is important to place on the road between Pisa and Volterra, the etruscan city to which lari remains tied up to late antiquity. The origin of the name "Lari" has been traced back to the term etruscan and roman "Lar", tubular, protecting divinity of the communication routes campestri and by the name of Etruscan person "Lars". Conquered and fortified by the Longobards, up to the XI century remains free rural municipality. Today Lari preserves the imposing structures of the renaissance fortress, already residence of the Florentine vicars. In the complex are visible Etruscan, Roman and Renaissance (Della Robbia glazed ceramics), frescoes of medieval and Renaissance, the "Salone dei torments", Prisons, dungeons said "hell". The Village of Lari is composed from the ancient part, in a dominant position on a hill, and a modern part, that has developed around it toward the slopes of the hill. It is widespread and renowned the ancient art of mobile thanks to which are made objects spazianti from renaissance style up to modern.