Mistress of Mistresses is a fantasy novel by English writer Eric Rucker Eddison, the first in his Zimiamvian Trilogy. First published in 1935, it centers on political intrigues between the nobles and rulers of the Three Kingdoms of Rerek, Meszria and Fingiswold, following the death of King Mezentius, an extraordinary ruler who has held sway over three kingdoms mainly through force of character. Dissolution of the realm seems certain as alliances are formed and begin to intrigue against each other.