Geoffrey Ridel (died 1084) was the Duke of Gaeta as a vassal of the Prince of Capua from 1067 or 1068.

In 1061, he was one of the leaders of the first Norman campaign in Sicily

Sicily

Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...

. In 1067, he was appointed duke of Gaeta. He was the first Norman

Normans

The Normans were the people who gave their name to Normandy, a region in northern France. They were descended from Norse Viking conquerors of the territory and the native population of Frankish and Gallo-Roman stock...

 duke since William of Montreuil

William of Montreuil

William of Montreuil was an Italo-Norman freebooter of the mid-eleventh century. He was described by Amatus of Monte Cassino as an exceptional knight, small in stature, who was very robust, strong, valiant and by Orderic Vitalis as le Bon Normand, "the Good Norman."He was a son of the Guillaume...

 and the populace did not like him. Electing their own civil government, they expelled Geoffrey, who continued to rule the country side as duke from his castle at Pontecorvo

Pontecorvo

Pontecorvo is a town and comune in the province of Frosinone, Lazio, Italy. Its population is 13,400.- History :The village lies under Rocca Guglielma, a medieval fortification perched on an inaccessible spur...

. Geoffrey was succeeded by his son Reginald. His daughter, Eva or Anna, married John VI of Naples

John VI of Naples

John VI was the Duke of Naples from 1097 or 1107 to his death. He was the son and successor of Sergius VI. His reign is very obscure on the basis of slight documentary evidence. He followed his father's policy of close relations with Byzantium in light of Norman attacks, and was at some point...

.

Sources

• Amatus of Montecassino
  Amatus of Montecassino
  Amatus of Montecassino , a Benedictine monk at the Abbey of Montecassino is one of three Italo-Norman chroniclers, the others being William of Apulia and Goffredo Malaterra...
  
  . Ystoire de li Normant.
• Leo of Ostia
  Leo of Ostia
  Leo Marsicanus or Ostiensis , also known as Leone dei Conti di Marsi , was a nobleman and monk of Monte Cassino around 1061 and Italian cardinal from the twelfth century.In Monte Cassino, he became a friend of Desiderius of Benevento, later Pope Victor III, and it was to him that Leo dedicated...
  
   and Peter the Deacon
  Peter the Deacon
  Peter the Deacon was the librarian of the abbey of Montecassino and continuator of the Chronicon Monasterii Casinensis, usually called the Montecassino Chronicle in English. The chronicle was originally written by Leo of Ostia...
  
  . Chronicon Monasterii Casinensis.
• Chalandon, Ferdinand
  Ferdinand Chalandon
  Ferdinand Chalandon was a French medievalist and Byzantinist.Chalandon’s work remains the most substantial study of the Normans in Italy and though the details of what he wrote a hundred years ago have in places been modified, it remains the single most important work available to historians.Being...
  
  . Histoire de la domination normande en Italie et en Sicilie. Paris
  Paris
  Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...
  
  , 1907.
• Foundation for Medieval Genealogy: Southern Italy.