 San Severino remained Ghibellin, swearing loyalty to Manfred of Hohenstaufen, supporting the rebellions of other cities against the Pope.At the beginning of the 14th century San Severino managed to increase its domains with other castles, such as Pitino, Gagliole, Carpignano, Aliforni, Frontale and Isola, reaching the current territorial extension.After the death of Manfred (1266), the Guelphs got the upper hand and San Severino came under the control of the Pope.