The Collaborative International Dictionary of English v.0.48:

Doucepere \Douce"pere`\, n. [F. les douze pairs the twelve peers
   of France, renowned in romantic fiction.]
   One of the twelve peers of France, companions of Charlemagne
   in war. [Written also douzepere.] [Obs.]
   [1913 Webster]

         Big-looking like a doughty doucepere.    --Spenser.
   Doucet