Borg

Borg the Blind was King of Gewisse.
He was often nicknamed Blindfell because of the blindfold he wore.
With his sister dead of cancer and his brother dead in battle, only he could inherit as a close family-member. But the decision was ultimately the witena's. Amazingly, they chose him.
He underwent cataracts surgery from a British surgeon. He successfully removed the lens. Borg was from thereon able to see again, albeit extremely badly, only distinguishing vague shapes. Better than his near-total blindness.
Borg was stabbed to death in his mead hall in 518 AD during dinner by conspirators who judged he was not a good or capable leader. They also killed his wife.