Aerys II Targaryen ( the Mad King, Aerys the Mad, King Scab )
Aerys II Targaryen, also called Aerys the Mad, the Mad King, and King Scab, was the seventeenth and last member of the Targaryen dynasty to sit the Iron Throne, ruling from 262AL to 283AL.
Aerys showed great promise at the start of his reign, bringing peace and prosperity to the Seven Kingdoms, but later descended into insanity following the brief uprising known as the Defiance of Duskendale, in which he was held prisoner for several months by a rebellious lord. After that, his paranoia and cruelty grew out of control.
He was eventually killed by a member of his own Kingsguard, Ser Jaime Lannister, during Robert’s Rebellion.