Dudo, or Dudon, was a Picard historian, and dean of Saint-Quentin, where he was born in the 960s. He was an erudite scholar and he likely acquired his education in Liège or perhaps Laon. By 987, Dudo had become a canon at St Quentin, the abbacy of which was held by the counts of Vermandois. In that year he was sent on a diplomatic mission to Richard I of Normandy by Albert I, Count of Vermandois, which was successful. Dudo became a frequent visitor to the Norman court in the two years prior to Richard's death in 996. In a letter to Adalbero, Bishop of Laon, Dudo said that, as a result, Richard asked him to write a work recording "the customs and deeds of the Norman Land, the rights established within the kingdom of his grandfather Rollo". During a second stay in Normandy, Dudo wrote his history of the Normans, a task which Duke Richard had urged him to undertake. Very little else is known about his life, except that he died before 1043.
Historia Normannorum
Written between 996 and 1015, his Historia Normannorum—also known as Libri III de moribus et actis primorum Normanniae ducum and Gesta Normannorum—was dedicated to Adalberon, bishop of Laon. Dudo does not appear to have consulted any existing documents for his history, but to have obtained his information from oral tradition, much of it being supplied by Raoul, count of Ivry, a maternal half-brother of Duke Richard. Consequently, the Historia partakes of the nature of a romance, and on this ground has been regarded as untrustworthy by historians such as Ernst Dümmler and Georg Waitz. Other authorities, such as Jules Lair and Johannes Steenstrup, while admitting the existence of a legendary element, regard the book as of considerable value for the history of the Normans.