Ignotus Peverell was the third of the three Peverell brothers, the original creators of the Deathly Hallows. His brothers were Cadmus and Antioch. He created the Cloak of Invisibility (DH21). The Potters descend from Ignotus (DH35).
Ignotus is buried in an old grave in Godric's Hollow; the tombstone has the symbol of the Hallows engraved on it. Harry Potter and Hermione Granger saw the grave when they visited the village, on December 24, 1997 (DH16).