Earthsea Trilogy -- by Ursula K. Le Guin

• A Wizard of Earthsea
  
• The Tombs of Atuan
  
• The Farthest Shore
  

Ged was the greatest sorcerer in all Earthsea, but once he was called Sparrowhawk, a reckless youth, hungry for power and knowledge, who tampered with long-held secrets and lossed a terrible shadow upon the world...