Queen Tiana (formerly known as Princess Tiana) is a character in ABC's Once Upon a Time. Realizing the poverty and despair spread throughout the land, Tiana started a resistance group to overthrow the tyranny of the King and Lady Tramaine. She is the daughter of Queen Eudora, the love interest of Prince Naveen and the best friend of Ella Mills, as well as the Queen of the New Enchanted Forest after the defeat of Lady Tremaine. In Hyperion Heights, she became known as Sabine, who is roommates with Ella's counterpart, Jacinda.
Tiana is based on the character of the same name from Disney's The Princess and the Frog and the princess from the fairy-tale, The Frog Prince.