Mary Bartlet Leader

'Mary Bartlet Leader Born March 19, 1918, was an Author of two novels, Triad: A Novel of the Supernatural (1972) and Salem’s Children (1979).Triad was the inspiration behind the popular Fleetwood Mac song "Rhiannon".

Leader died on April 27, 2004, in Mequon, Ozaukee, Wisconsin.

...
Wikipedia