The Rajah's secret

The Rajah had a secret, he had green hair,
So he always wore a hat, so that no one would stare.
No one knew his secret in all the land,
Except his barber, who said it looked grand.
Gopal never told a soul, for many a year,
So he went to the forest, out of fear.
He told the tallest tree: 'You must believe me,
The Rajah wears a hat to hide his bright green hair.'