Absolutely. A positively great book. I always think of it as Twain's penance for writing the scurrilously anti-Catholic Connecticut Yankee.
Not sure how Pro-Catholic the Joan of Arc story is....
She was burned at the stake for heresy via the findings of a Catholic Church court proceedings.
Makes the Catholic Church out to be, at best, the pawns of the politics of the day and thus at the time, the servants of the English.