there was once on a time a king who had three sons, of whom two were clever and wise, but the third did not speak much, and was simple, and was called the simpleton. when the king had become old and weak, and was thinking of his end, he did not know which of his sons should inherit the kingdom after him.

How would the previous sentence be correctly capitalized?
There was once on a time a King who had three sons, of whom two were clever and wise, but the third did not speak much, and was simple, and was called the Simpleton. When the King had become old and weak, and was thinking of his end, he did not know which of his sons should inherit the kingdom after him.