Bertran de Born (Occitan: [beɾˈtɾan de ˈbɔɾn]; c. 1179 – 1233), called lo Filhs ([lu ˈfiʎʃ], "the Son"), was a Limousin knight and troubadour.
Since the younger Bertran would have only been fourteen at the time of the troubadour's activity, the filhs of the chansonniers must be the eldest son.
The sirventes "Quan voi lo temps renovelar", written in 1206 in the style of his father, is attributed to "Bertran de Born" in the chansonniers, but since the elder Bertran had retired to the monastery of Dalon in 1197, this reference must be to his son.
The sirventes is preceded by a long razo explaining the misfortunes of John Lackland and his evil, which is the subject of the poet's vitriol.
An interesting cultural cross-reference occurs in the work when Bertran mentions the chanson de geste called the Siège d'Orange.