Guy I was the Duke of Spoleto from 842. He was the son of Lambert I of Nantes

Lambert I of Nantes

Lambert I was the Count of Nantes and Prefect of the Breton March between 818 to 831 and Duke of Spoleto between 834 and 836. Lambert succeeded his father Guy....

 and Adelaide of Lombardy, the eldest daughter of Pepin of Italy. He travelled with his father in 834 in the entourage of Lothair I

Lothair I

Lothair I or Lothar I was the Emperor of the Romans , co-ruling with his father until 840, and the King of Bavaria , Italy and Middle Francia...

. He was given the abbey of Mettlach

Mettlach

Mettlach is a municipality in the district Merzig-Wadern, in Saarland, Germany. It is situated on the river Saar, approx. 7 km northwest of Merzig, and 30 km south of Trier.Villeroy & Boch's headquarters are in Mettlach....

 in Lotharingia

Lotharingia

Lotharingia was a region in northwest Europe, comprising the Low Countries, the western Rhineland, the lands today on the border between France and Germany, and what is now western Switzerland. It was born of the tripartite division in 855, of the kingdom of Middle Francia, itself formed of the...

 in 840, when the Emperor Louis the Pious

Louis the Pious

Louis the Pious , also called the Fair, and the Debonaire, was the King of Aquitaine from 781. He was also King of the Franks and co-Emperor with his father, Charlemagne, from 813...

 died.

Guy married Itta (or Ita or Itana), daughter of Sico of Benevento

Sico of Benevento

Sico was the Lombard Prince of Benevento from the 817 to his own death.-Life:Before becoming the Prince of Benevento, he had been the gastald of Acerenza. On the assassination of Grimoald IV, Sico succeeded to the princely throne...

. Their sons were Lambert I

Lambert I of Spoleto

Lambert I was the duke and margrave of Spoleto on two occasions, first from 859 to 871 and then from 876 to his death.Lambert was the eldest son of Guy I of Spoleto and Itta, daughter of Sico of Benevento...

 and Guy III

Guy III of Spoleto

Guy of Spoleto , sometimes known by the Italian version of his name, Guido, or by the German version, Wido, was the Margrave of Camerino from 880 and then Duke of Spoleto and Camerino from 883. He was crowned King of Italy in 889 and Holy Roman Emperor in 891...

. In 843, he interfered in the Beneventan civil war on the side of his brother-in-law Siconulf

Siconulf of Salerno

Siconulf was the first prince of Salerno, the brother of Sicard, prince of Benevento , who was assassinated by Radelchis. In response to Sicard's murder, the people of Salerno proclaimed Siconulf prince in opposition to Radelchis. At the time Radelchis was holding Siconulf prisoner in Taranto...

. He acted as arbiter several times for high fees, but only Lothair's successor, the Emperor Louis II, could end the strife. In 846, he alone succeeded in driving the Saracens out of Latium

Latium

Lazio is one of the 20 administrative regions of Italy, situated in the central peninsular section of the country. With about 5.7 million residents and a GDP of more than 170 billion euros, Lazio is the third most populated and the second richest region of Italy...

 after their sack of Saint Peter's Basilica

Sack of Rome (846)

In 846 Arab raiders plundered the environs of Rome, including the Vatican, sacking Old St. Peter's and St. Paul's-Outside-the-Walls, but were prevented from entering the city itself by the Aurelian Wall...

 in Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

.

In 858, he supported Adhemar of Salerno

Adhemar of Salerno

Adhemar was the son of Prince Peter of Salerno. He succeeded his father, an usurper, in 853.Adhemar's rule was unpopular. The counts of Capua whittled away at his princely authority and territory...

 against the pretensious count of Capua, Lando I

Lando I of Capua

Lando I was the count of Capua from 843. He was the eldest son and successor of Landulf the Old. Like his father, he supported Siconulf against Radelchis in the civil war dividing the Principality of Benevento in the 840s....

, and by his interevention secured the Liri Valley, with Sora

Sora, Italy

Sora is a city and comune of Lazio, Italy, in the province of Frosinone. It is built in a plain on the banks of the Liri. This part of the valley is the seat of some important manufactures, especially of paper-mills....

 and Arpino

Arpino

Arpino is a comune in the province of Frosinone in the region of Latium in central Italy. Its Roman name was Arpinum.-History:...

 taken from the count's brother Landenulf of Teano.

Sources

• Llewellyn, Peter. Rome in the Dark Ages. London: Faber and Faber, 1970. ISBN 0 571 08972 0.
• di Carpegna Falconieri, Tommaso. Guido, in Dizionario biografico degli italiani, 61, Roma: Istituto della Enciclopedia italiana, 2003, p. 352-354.