“You see that house upon the hillside, Potter? My father lived there. My mother, a witch who lived here in this village, fell in love with him. But he abandoned her when she told him what she was. . . . He didn’t like magic, my father . . . “He left her and returned to his Muggle parents before I was even born, Potter, and she died giving birth to me, leaving me to be raised in a Muggle orphanage . . . but I vowed to find him . . . I revenged myself upon him, that fool who gave me his name . . . Tom Riddle. .
Similar to my comment about Bill and Fleur, I wonder if Rowling had the Voldemort/Riddle/Marvolo backstory figured out already, or if this is just a rough outline that she filled in later.

