Among the more outstanding of the Frankish dukes, Guido I divided the duchy between his two sons Lambert and Guido II, who received as his share the lordship of Camerino, which was made a duchy.
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In 1158 the emperor gave the duchy to Guelf VI of Este; Henry VI invested Conrad of Urslingen with it, upon whose death in 1198 it was ceded to Pope Innocent III, but then was occupied by Otto of Brunswick in 1209, who made Dipold von Vohburg duke.
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Alberico I, Duke of Camerino (897), and afterwards of Spoleto, married the notorious Roman noblewoman Marozia, mistress of Pope Sergius III (904–911), and was killed by the Romans in 924.
He saved the northeast of Italy by defeating the Slav tribes and maintained internal order by suppressing the baronial revolts and autonomy of the duchies of Friuli and of Spoleto, where he installed Thrasimund.
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The city under the latter was the seat of a marquisate and then of a duchy which was sometimes under the suzerainty of Spoleto, and which was later conquered by the Franks.
When Theodicius of Spoleto died fighting at the Siege of Pavia in 774, the Lombards of the Duchy of Spoleto elected Hildeprand their duke and quickly submitted to the Franks.
He succeeded his father in Brescia as count (Brixiae comes) in 822 and, following the brief reign of Adelard, in Spoleto as duke in August 824.
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.
He was also vicar of Bevagna starting from 1371, as well as Papal commander and gonfaloniere of the Duchy of Spoleto.
Guidantonio (1403–1443) was appointed ruler of the Duchy of Spoleto by Pope Martin V (1419) and carried on war against Braccio da Montone with varying fortune.