 The first settlers in the area were the Sidicini; the Etruscans founded here the town of "Cesennia", which later passed under Roman control.After the fall of the Western Roman Empire, Mignano became part of the Lombard Duchy of Benevento and, in 776, part of the County of Capua.In 1139 the nearby Galluccio was the seat of a successful ambush of Roger II of Sicily's troops against the army of Pope Innocent II, who, captured, was forced to sign a treaty of peace in the Mignano castle.