Gwendolyn Piper (née Cromwell) is one of the main characters of the Halloweentown franchise. She is the mother of Marnie Piper, Dylan Piper, and Sophie Piper and the only daughter of Agatha "Aggie" Cromwell who fell in love with the mortal William, surpassing her magic to live in the human world. However, all three of her children inherited their mother's magical abilities, causing Gwen to raise them as humans.