Castelseprio or Castel Seprio was the site of a Roman fort in antiquity, and a significant Lombard town in the early Middle Ages, before being destroyed and abandoned in 1287. It is today preserved as an archaeological park in the modern comune of Castelseprio, near the modern village of the same name. It is in the north of Italy, in the Province of Varese, about 50 km northwest of Milan.