Sergius V was the son and successor of

John V John V may refer to: * Patriarch John V of Alexandria or John the Merciful (died by 620), Patriarch of Alexandria from 606 to 616 * John V of Constantinople, Patriarch from 669 to 675 * Pope John V (685–686), Pope from 685 to his death in 686 * J ...

Duke of Naples The Dukes of Naples were the military commanders of the ''ducatus Neapolitanus'', a Byzantine outpost in Italy, one of the few remaining after the conquest of the Lombards. In 661, Emperor Constans II, highly interested in south Italian affairs (h ...

from 1042 to 1082. In the summer of 1074, hostilities flared up between

Richard I of Capua Richard Drengot (died 1078) was the count of Aversa (1049–1078), prince of Capua (1058–1078, as Richard I) and duke of Gaeta (1064–1078). Early career in Italy Richard, who came from near Dieppe in the Pays de Caux in eastern Normandy, was t ...

and

Robert Guiscard Robert Guiscard (; Modern ; – 17 July 1085) was a Norman adventurer remembered for the conquest of southern Italy and Sicily. Robert was born into the Hauteville family in Normandy, went on to become count and then duke of Apulia and Calabri ...

. Sergius allied with the latter and made his city a supply centre for Guiscard's troops. This pitted him against

Aversa Aversa () is a city and ''comune'' in the Province of Caserta in Campania, southern Italy, about 24 km north of Naples. It is the centre of an agricultural district, the ''Agro Aversano'', producing wine and cheese (famous for the typical bu ...

and

Capua Capua ( , ) is a city and ''comune'' in the province of Caserta, in the region of Campania, southern Italy, situated north of Naples, on the northeastern edge of the Campanian plain. History Ancient era The name of Capua comes from the Etrusc ...

, while Richard I was supported by the Pope. Sergius soon opened negotiations with

Pope Gregory VII Pope Gregory VII ( la, Gregorius VII; 1015 – 25 May 1085), born Hildebrand of Sovana ( it, Ildebrando di Soana), was head of the Catholic Church and ruler of the Papal States from 22 April 1073 to his death in 1085. He is venerated as a saint ...

, as he had barely escaped destruction in June. These negotiations were concurrent with those of the two

Norman Norman or Normans may refer to: Ethnic and cultural identity * The Normans, a people partly descended from Norse Vikings who settled in the territory of Normandy in France in the 10th and 11th centuries ** People or things connected with the Norm ...

princes, mediated by the abbey of

Montecassino Monte Cassino (today usually spelled Montecassino) is a rocky hill about southeast of Rome, in the Latin Valley, Italy, west of Cassino and at an elevation of . Site of the Roman town of Casinum, it is widely known for its abbey, the first h ...

Sources

* Chalandon, Ferdinand. ''Histoire de la domination normande en Italie et en Sicilie''.

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...

, 1907. 1082 deaths 11th-century dukes of Naples Year of birth unknown {{Italy-noble-stub