The Conventum is a Latin text from around 1030 that narrates the relations between Duke William V of Aquitaine and Lord Hugh IV of Lusignan in the preceding twenty years. The exact nature of the text is a matter of scholarly disagreement. It has been seen as a record of a legal settlement and as a sui generis literary text presaging the chanson de geste. It concerns Hugh's disputes over land and castles with various other barons of Aquitaine and William's failure to help him. The text is written from Hugh's point of view.

The Conventum is preserved in three manuscripts, none original.

In two manuscripts now in the Bibliothèque nationale in Paris, the Conventum is found alongside the Chronicle of Ademar of Chabannes. The earlier of these, Latin 5927, was probably made within two decades of the events described in the Conventum. It was most likely copied from the original document at the abbey of Saint-Martial of Limoges. The Conventum occupies pages 266–280 and is 341 or 342 lines long. It was copied by a single scribe who used the ampersand ligature for the letter combination et even where it occurs within words.

The later Bibliothèque manuscript, Latin 9767, dates to the 15th century. Its contents are very similar to those of Latin 5927. The Conventum is found at folios 62v–66r. Jules Chavanon argued that it was copied directly from Latin 5927. It is more likely, however, that it was made from a defective copy of the Conventum, since a large section is missing, perhaps corresponding to a missing folio in its exemplar. It is otherwise almost identical to Latin 5927

The third copy, made towards the end of the 11th century, is found at folios 89v–93r of the manuscript Latin F.v.IVN3 in the National Library of Russia in Saint Petersburg. It was probably copied from Latin 5927.

In addition to the three known copies, there is a "rewritten fragment" from the beginning of the Conventum in a 17th-century manuscript from Paris, now Collection Dupuy 822 in the Bibliothèque nationale. The scribe records that it came "out of an old codex", which may indicate a fourth copy once existed.

There have been five published editions of the Conventum. The first was by Jean Besly for his Histoire des comtes de Poictou et ducs de Guyenne, published at Paris in 1647. The second was by Philippe Labbe at Paris in 1657, based on Latin 5927. A third edition, based on the two earlier ones, was made by Martin Bouquet for the Recueil des historiens des Gaules et de la France [fr] in 1767. The Besly and Bouquet editions are corrupt. A new edition based on Latin 5927 was made by Jane Martindale in 1969. The latest edition, with accompany French and English translations, was published in 1995.

The Conventum does not contain any dates. Internal evidence suggest that the events it records took place over a period of several years, perhaps as many as fifteen. All the identifiable individuals it mentions were active between about 1010 and 1030. More specifically, the central dispute can be placed between about 1022 and 1028. It began while Gislebert and Gerald I were still bishops of Poitiers and Limoges, respectively, and both bishops appear to have died in 1023. The dispute was resolved with the help of Count William II of Angoulême, who died in March 1028. The Conventum was probably composed around 1030, since it presents both the duke and Hugh as living, while the duke died in 1030 and Hugh in 1032.