Castle on the Hill is a book needed to complete the Quest Poem From A Pirate given by the Sea Scholar. It can be obtained from Pirate Captains when that Quest is active.
Text
The sun cries over the looming mountain
The trees dancing to the sky of love
The sea swaying like a moving fountain
With the castle on the hill above
The men come down with shining weapons
They weild their blades with mighty gloves
Their eyes buen red with look that threaten
With the castle on the hill above
The swords plunge into the enemy armor
The scream cry out like a mourning dove
Their eyes turn cold like a weeping martyr
With the castle on the hill above
The wolf cries out at the end of battle
The moon shines over the field of blood
The wind moving like a dying candle
With the castle on the hill above