Teresa Edgerton (born 1949) is an author of fantasy novels and short stories set in worlds that parallel the Middle Ages and the 18th century.
She met her husband, John Edgerton, in 1971, when she was working as a Tarot reader at a local Renaissance faire, and he was part of a Society for Creative Anachronism troupe putting on demonstrations of medieval tourney combat.
Her interest in medieval society, alchemy, magic, and Celtic mythology led her to begin writing the Green Lion Trilogy.
The first book of the series, Child of Saturn, was a finalist for the Compton Crook Award.
In 2004 she was offered the chance to relaunch under the pseudonym Madeline Howard, and has since started a new trilogy, Rune of the Unmaking, with the first novel, The Hidden Stars.