Historical account of King Richard I of England (1157-1199); features Kurdish Muslim general Saladin (1138-1193) and King Philippe II Auguste of France (1165-1223).
According to the first chapter (by Dr. Michael J. Vassallo) in the "The invincible Gene Colan" bibliographical book (Marvel), this story was penciled by Gene Colan (see page 12).
The story was slated for the never-printed issue #2 of The Witness (Marvel, 1948 series).