He died in Gascony, before his father died, so his son John was his father's heir.
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M > Mohun | D > de Mohun > John (Mohun) de Mohun
Categories: Dunster, Somerset | Early Barony of Dunster
Volume 1 By John Burke, Sir Bernard Burke · 1850
Ann Mohun, daughter of Sir John Mohun, married Sir Geoffrey Warmwell....this is the only John Mohun who fits the bill. So perhaps an additional daughter of Ann
edited by Michael Meggison
https://en.wikipedia.org/wiki/Feudal_barony_of_Dunster#Reginald_de_Mohun_(1206%E2%80%931258)
He never had the barony, because dvp.
Somerset may also want to be Somersetshire, in this era.
If he died in Landes Forest, Aquitaine in 1253... he literally wasn't in France.
Landes forest is also in Gascony. Which may or may not have then been controlled by the Duchy of Aquitaine. Dunno.
Note the town Landes department (in Girones) didn't exist until after the Revolution centuries later, so we can't use the current: Landes, Girones, Nouvelle-Aquitaine, France hierarchy. But here is where this is now:
https://en.wikipedia.org/wiki/Landes_forest https://en.wikipedia.org/wiki/Landes_(department)