Ubiquitous Fantasies of the late 1970s

When Del Rey published Terry Brooks's The Sword of Shannara in April 1977, they launched it with an unprecedented marketing campaign for a fantasy novel. Thus it reached the bestseller lists, a triumph of marketing over content.  Other publishers saw the opportunity for large sales of fantasy novels.  I remember a handful of books that were omnipresent for many months in every bookstore I visited during the wake of the success of The Sword of Shannara. These are the ones I recall. 

Niel Hancock's first tetralogy "The Circle of Light" sported covers by Gervasio Gallardo, which deliberately evoked the Ballantine Adult Fantasy series (for which Gallardo did many covers) which had ended a few years earlier. 

The first of the quartet, Greyfax Grimwald, came out in April 1977, followed by Faragon Fairingay in June, Calix Stay in August, and Squaring the Circle in October. These were followed by two further tetralogies, "The Wilderness of Four," in 1983, and "The Windameir Circle," in 1985-1991, along with a standalone volume, Dragon Winter, in March 1978 (which has a faux-Gallardo cover). The second quartet also had real Gallardo covers, as did the first volume of the third quartet. But sales must have diminished as the series went on, and the books went out of print. Tor's Starscape imprint, for young adult books, revived the first quartet in 2004, with silly, off-putting covers, and they sank without a trace. 

Richard Monaco's Parsival, appeared in hardcover and trade paperback in November 1977. The cover and interior illustrations are by David McCall Johnston, another cover artist of the Ballantine Adult Fantasy series. It was followed by The Grail War (hardcover and trade paperback, 1979) and The Final Quest (hardcover 1980, mass market paperback 1983).  A fourth volume, Blood and Dreams, appeared as a mass market original in 1985.

Stephen R. Donaldson's trilogy of "The Chronicles of Thomas Covenant the Unbeliever" came out in hardcover in October 1977, but weren't ubiquitous until the Del Rey mass market paperbacks appeared, Lord Foul's Bane in August 1978, The Illearth War in September 1978, and The Power That Preserves in March 1979.  With static covers (by Darrell Sweet), Del Rey again reached the bestseller lists with these books, despite the main character being an unpleasant leper who refuses to believe in the fantasy world in which he finds himself. It was another triumph of marketing over content.  Donaldson went on to publish a second trilogy, "The Second Chronicles of Thomas Covenant the Unbeliever" (1980-1983); and a third series, expanded to a quartet, "The Final Chronicles of Thomas Covenant" (2004-2013). 

 And finally, there is Nancy Springer's The White Hart, published in December 1979 (cover by Carl Lundgren). It was the first of a five book series, later named "The Books of Isle" (1979-1983), though the second volume, The Silver Sun, is reworked from an earlier volume The Book of Suns, published in June 1977 and marketed as general fiction rather than as fantasy (cover shown below for comparison). 

 These are the books I thought of as ubiquitous between 1977 and 1980. Any one have other candidates?