The Magician Trilogy is a series of three children's fantasy novels by the British author Jenny Nimmo, first published by Methuen 1986 to 1989. It is sometimes called the Snow Spider trilogy or series after the first book and "The Snow Spider Trilogy" is the title of its omnibus editions (1991 and later). The stories are inspired by Welsh mythology, with elements borrowed from "Mabinogion". Set in contemporary Wales, they feature Gwyn Griffiths, a boy descended from Gwydion who discovers and develops some of the magical power in his lineage.