Sire de Bourbon
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The Sire de Bourbon or Seigneur de Bourbon was the title held by the rulers of Bourbonnais until 1327 when Louis I was created Duke of Bourbon. The title dates back to the at least to the early tenth century and Adhémar or Aymar of Bourbon.
[edit] See also
List of seigneurs, later dukes, of Bourbon (in French)