The Zimiamvian Trilogy is a series of fantasy novels by English author E. R. Eddison.
Some chapters in each of the novels take place on Earth in the 20th century, but the novels are largely set in a parallel world named Zimiamvia, which primarily comprises the Three Kingdoms of Fingiswold, Meszria and Rerek (though other lands, such as Akkama, are also referred to).
[1] Literary critic Don D'Ammassa has claimed that the Zimiamvian trilogy has "powerfully drawn" characters, especially the villains.
[3] In Mistress of Mistresses the underlying philosophy is a pantheism similar to that espoused by Baruch Spinoza, pantheism mysteriously combined with polytheism (characters routinely swear by "the Gods").
There are both a supreme male God, named as Zeus in The Mezentian Gate, whose avatars include Duke Barganax and Lessingham, and a supreme Goddess, identified with the eternal feminine and with Aphrodite, and temporarily incarnated in the two queens whom Lessingham serves.