The Belgariad
The romances of William Morris, such as "The Well at the World's End", set in an imaginary medieval world, are sometimes regarded as the first examples of high fantasy. The works of J. R. R. Tolkien—especially "The Lord of the Rings"—are regarded as archetypal works of high fantasy. Also, Lloyd Alexander's "The Chronicles of Prydain", Stephen R. Donaldson's "The Chronicles of Thomas Covenant" and David Eddings' "The Belgariad" are good examples of high fantasy series.