Sereus
Encyclopedia
Sereus, Serenus, or Severus was the Duke of Aquitaine
Duke of Aquitaine
The Duke of Aquitaine ruled the historical region of Aquitaine under the supremacy of Frankish, English and later French kings....

 briefly following the dukedom of Austrovald
Austrovald
Austrovald, Astrobald, and Austrevald was the Duke of Aquitaine from 587.Austrovald was probably a count of Toulouse until that year, when he was appointed to succeeded the dux Desiderius in Aquitaine, by King Guntram....

. Monlezun's reliance on the Charte d'Alaon
Charte d'Alaon
The Charte d'Alaon is a spurious and fraudulent charter purporting to provide a genealogy of the house of Odo the Great, Duke of Aquitaine . The nineteenth-century French historian Joseph-François Rabanis proved it to be a hoax fabricated in the seventeenth century...

makes it likely that this individual is spurious or mis-identified.

Sources

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