 In order to counter the expansive policy of the municipality of Narni, perpetually disputed with the municipalities of Terni and Rieti, and with the aim of restructuring the Pontifical State, Innocent III will grant Stroncone municipal autonomy in 1215 (LANZI 1895).From this moment on, the policy of the center will always follow the guelph side so much that on the coat of arms of the commune appear the white cross on red background and the pontifical keys.Stroncone is next to Narni in supporting the Pope's army against the imperial troops of Frederick II of Swabia, supported by the municipality of Terni.