William of Ockham is best known today for the model of problem solving known as Ockham’s (or Occam’s) Razor. But the event that defined his life was an argument with Pope John XXII.
Research:

Théophile Steinlen Beyond 'Le Chat Noir'
38:26

Hercules Posey & the President’s House
45:15

SYMHC Classics: Pueblo Revolt
24:21