Ser Willis Fell was a knight of House Fell and a member of the Kingsguard during the reigns of Viserys I and Aegon II Targaryen.
He choose the side of King Aegon II Targaryen in the civil war known as the Dance of the Dragons.
During the Fall of King's Landing, the Master of whisperers, Lord Larys Strong smuggled King Aegon II, Princess Jaehaera and Prince Maelor Targaryen to safety. Ser Rickard Thorne and Ser Willis Fell accompanied them. Lord Larys led them out through a secret passage of Maegor's Holdfast, of which only he had knowledge. Willis was put in charge of Princess Jaehaera and was commanded to see her safely to Storm's End. Ser Willis is the only member of Viserys I's Kingsguard at the time of his death who is not currently known to have died in the civil war or its aftermath.