King Philip of Spain hates his more popular brother, Don Jon. Dolores, the daughter of the captain of the palace guard, loves Don Jon. Dolores and Don Jon want to marry, but her father, Mendoza, forbids it because obviously a marriage will be arranged for Don Jon with some foreign royal as a political alliance. The two take the first steps toward eloping, but then the Philip and Jon get into a scuffle and Jon is killed. Mendoza takes the wrap, because he idolizes the King with naive zeal. Dolores takes a drastic approach to saving her father’s life.