Dudo of Saint-Quentin in the context of "Richard the Fearless"

Rollo (Norman: Rou, Rolloun; Old Norse: Hrólfr; French: Rollon; c. 835/870 – 933), also known with his epithet, Rollo "the Walker", was a Viking who, as Count of Rouen, became the first ruler of Normandy, a region in today's northern France. He was prominent among the Vikings who besieged Paris in 885–886, and he emerged as a war leader among the Norsemen who had secured a permanent foothold on Frankish soil in the valley of the lower Seine after the Siege of Chartres in 911. Charles the Simple, king of West Francia, agreed to the Treaty of Saint-Clair-sur-Epte, which granted Rollo lands between the river Epte and the sea in exchange for Rollo agreeing to end his brigandage, swear allegiance to Charles, convert to Christianity, and pledge to defend the Seine estuary from other Viking raiders.

Rollo's life was recorded by Dudo of St. Quentin. Historians such as W. Vogel, Alexander Bugge, and Henri Prentout have debated whether Dudo's account is historically accurate, and Rollo's origin and life are heavily disputed.

Richard I (28 August 932 – 20 November 996), also known as Richard the Fearless (French: Richard Sans-Peur; Old Norse: Jarl Rikard), was the count of Rouen from 942 to 996. Dudo of Saint-Quentin, whom Richard commissioned to write the "De moribus et actis primorum Normanniae ducum" (Latin, "On the Customs and Deeds of the First Dukes of Normandy"), called him a dux. However, this use of the word may have been in the context of Richard's renowned leadership in war, and not as a reference to a title of nobility. Richard either introduced feudalism into Normandy or he greatly expanded it. By the end of his reign, the most important Norman landholders held their lands in feudal tenure.

William III (913 – 3 April 963), called Towhead (French: Tête d'étoupe, Latin: Caput Stupe) from the colour of his hair, was the "Count of the Duchy of Aquitaine" from 959 and Duke of Aquitaine from 962 to his death. He was also the Count of Poitiers from 935 and Count of Auvergne from 950. The primary sources for his reign are Ademar of Chabannes, Dudo of Saint-Quentin, and William of Jumièges.

Poppa of Bayeux (French: [pɔpa d(ə) bɛjø]; born c. 880) was the wife more danico of the Viking leader Rollo. She was the mother of William I Longsword, Gerloc and grandmother of Richard the Fearless, who forged the Duchy of Normandy into a great fief of medieval France. Dudo of Saint-Quentin, in his panegyric of the Norman dukes, describes her as the daughter of a "Count Berengar", the dominant prince of that region, who was captured at Bayeux by Rollo in 885 or 889, shortly after the siege of Paris. This has led to speculation that she was the daughter of Berengar II of Neustria.

There are different opinions among medieval genealogy experts about Poppa's family. Christian Settipani says her parents were Guy de Senlis and Cunegundis, the daughter of Pepin, Count of Vermandois, and sister of Herbert I, Count of Vermandois. Katherine Keats-Rohan states she was the daughter of Berengar II of Neustria by Adelind, whose father was Henry, Margrave of the Franks, or Adela of Vermandois. Her parentage is uncertain and may have been invented after the fact to legitimize her son's lineage, as many of the fantastic genealogical claims made by Dudo were. Based on her separate more danico status that differentiates her from Rollo's Christian wife Gisela of France, Poppa's family was unlikely to have been powerful Christian nobility who would have insisted—by force if necessary—on a legal and monogamous Christian marriage for their daughter. Poppa was likely a common woman taken from a country with which the Norse had trade contact.

William of Jumièges (born c. 1000 – died after 1070) (French: Guillaume de Jumièges) was a contemporary of the events of 1066, and one of the earliest writers on the subject of the Norman conquest of England. He is himself a shadowy figure, only known by his dedicatory letter to William the Conqueror as a monk of Jumièges. Since he also mentions that he was an eyewitness of some events from the reign of Duke Richard III (1026-7), it seems reasonable to assume that he was born some time about the year 1000. He probably entered the monastery during the first quarter of the eleventh century and received his education from Thierry de Mathonville. According to Orderic Vitalis, William's nickname was "Calculus". The meaning behind this nickname is unknown. His death, after 1070, is unrecorded. He was a Norman writing from a Norman point of view. Although only a monk with evidently no military training, he wrote with pride in the accomplishments of his people.

William of Jumièges was the original compiler of the history known as the Gesta Normannorum Ducum ("Deeds of the Dukes of the Normans"), written in about 1070. This was built upon the framework of an earlier history compiled by Dudo of Saint-Quentin, De moribus et actis primorum Normannorum ducum, between c. 996 and c. 1015. This work was commissioned by Duke Richard I, and "was renewed by his half-brother, Count Rodulf of Ivry, and his son Duke Richard II (996-1026)... Dudo's work was taken up by William of Jumièges in the 1050s, who revised, abbreviated and updated his De moribus and added an account of the reigns of Dukes Richard II, Richard III (1026-7), Robert I (1027-35), and William II [William the Conqueror]." He finished this by 1060 but added to it later when William the Conqueror had become king of England, bringing events up to 1070. The Gesta Normannorum Ducum was later expanded by the 12th-century monkish chroniclers Orderic Vitalis and Robert of Torigni.

Gesta Normannorum Ducum (Deeds of the Norman Dukes) is a chronicle originally created by the monk William of Jumièges just before 1060. In 1070 William I had William of Jumièges extend the work to detail his rights to the throne of England. In later times, Orderic Vitalis (d. c. 1142) and Robert of Torigni (d. 1186), extended the volumes to include history up until Henry I.

The Gesta Normannorum Ducum by William of Jumièges has become the principal work of Norman historical writings, one of many written to glorify the Norman Conquest of England. But unlike most it was probably started in the late 1050s as a continuation of Dudo's De moribus. The monk William returned to his writing after the Conquest, most probably at the request of William the Conqueror. The final version of his history was written at his monastery at Jumièges c. 1070–1071. During the twelfth century there were interpolations and additions, first by Orderic Vitalis, then by Robert of Torigni, who added an entire book on Henry I of England. During the medieval period his work was widely circulated and read, was an essential work in most monasteries and was the basic source on which the histories of Wace and Benoît de Sainte-Maure were based. William's Gesta Normannorum Ducum survives today in forty-seven manuscripts.