Renaud was Count of Poitiers (795-843) while Poitiers was part of Aquitaine. Renaud was preceded by Guerin of Poitiers (or Warin[us]) (638–677) and was succeeded by Bernard I of Poitiers (815–844). Wikipedia
The definitive Wikipedia entry for Renaud Of Poitiers. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Renaud_of_Poitiers