King's Invincible Weapon, Is Defeated by His Sister's Scheme

King's Invincible Weapon, Is Defeated by His Sister's Scheme
Lady of the Lake's Sword Becomes King's Invincible Weapon, but He Is Defeated by His Sister's Scheme
When King Uther dies and Britain faces chaos, Merlin presents an unknown named Arthur as the new king by birthright, as the late king's son, against the ambitious desires of his half-sister, Morgan.
TV series name: Camelot