The Good Witch of the North, sometimes named Locasta or Tattypoo, is a fictional character in the Land of Oz, created by American author L. Frank Baum. She is the elderly and mild-mannered ruler of Oz's northern quadrant called Gillikin Country. Her only significant appearance in Baum's work is in the second chapter of his classic children's novel The Wonderful Wizard of Oz (1900). She makes a brief cameo appearance along with Santa Claus at Princess Ozma's royal birthday party in Baum's The Road to Oz (1909), but is only mentioned and not physically seen throughout the rest of Baum's original series.
Baum presented her as an extremely kind, humorous and gentle character, one who proudly stood against the oppression and subjugation of people. In the Oz books, it is stated that she became the Good Witch of the North after overthrowing Mombi, the erstwhile Wicked Witch of the North. However, the character's kindness and magnanimity of spirit was not confined to her own domain, and she was loved not only by her own subjects but also by other clans in Oz, such as the eastern Munchkins. Although she wasn't as powerful as the Wicked Witch of the East and was hence unable to depose her the way she deposed Mombi, she was nonetheless exceedingly sensitive to their slavery and who the Munchkins regarded as their true friend. She also appears as a highly altered player in Ruth Plumly Thompson's The Giant Horse of Oz (1928), in which she is called Tattypoo.
Her role was significantly expanded in the 1902 musical extravaganza, in which L. Frank Baum officially named her Locasta. The character was more famously combined with that of Glinda, the Good Witch of the South, for the MGM's 1939 musical film version, portrayed by late actress Billie Burke as the Good Witch of the North.