Aerys II Targaryen, also called Aerys the Mad was the seventeenth and last member of the Targaryen dynasty to sit the Iron Throne.
He showed great promise at the start of his reign, bringing peace and prosperity to the Seven Kingdoms, but later descended into insanity.
He developed a deep fascination with fire which, over time, became a sadistic obsession.
Eventually killed by Ser Jaime Lannister.