It meant the top of his skull, which was or is called a crown.I don't agree, I think in this case his crown meant his virginity, let me explain:You don'y go up the hill to get water, in this case...
Jack and Jill were just typical English children. Jack is a nickname for John.
They were two kids who went up a hill to get a pail of water from the well at the top of the hill. They went up, then...