Power, Piety and Prestige: Art at the Courts of France c1340-1420
Any ideas?
( TFD is sporting this season's finest necropants, Sun 31 May 2009, 15:14, archived)

Hmm, tricky
You can get away with talking about "Louis" or "Henri" without being too specific.
And you get to use the word "Antipope": make the very most of this opportunity.
( Flapjack I spay a little mare for you, Sun 31 May 2009, 15:18, archived)