 Before the Roman conquest, the territory of Sigillo was inhabited by the "Suillates", an Umbri tribe; later it was a Roman municipality as Suillum and was a stage on the Via Flaminia.In 410 it was destroyed by the Goths of Alaric I during his march to Rome.Later it was part of the Lombard Duchy of Spoleto and of the gastaldate of Nocera, which, after the Frank conquest in the late 8th century, became the county of Nocera.