Brenhinoedd y Saeson (also Brenhinedd y Saesson) is the medieval title of a Middle Welsh annalistic chronicle.
Brenhinoedd y Saeson's main source is the Latin chronicle related to Annales Cambriae from which the two versions of Brut y Tywysogion derive.
As a result, Brenhinoedd y Saeson contains more material relating to the English kings than the two versions of Brut y Tywysogion.
The annals in the Black Book of Basingwerk are dependent on the Cotton Cleopatra version up to the latter's final entry in 1198.
The continuation of the Peniarth 20 Brut y Tywysogion is the source for the years up to 1331, after which the material is probably the work of Gutun Owain himself.