Encyclopedia Britannica, Treatise on @ Louis I

(Ref: Louis I) This citation is considered to be direct and primary evidence used, or by dominance of the evidence.
Encyclopedia Britannica, Treatise on. 

• References (3)
  • Parent Source: Encyclopedia Britannica, Treatise on
  • Individual: Louis I "The Pious" France King of
  • Individual: Ermengarde de Hesbaye