Mildred Downey Broxon (born June 7, 1944 in Atlanta, Georgia) is an American science fiction and fantasy author.
She studied psychology and worked as an assistant teacher for the mentally handicapped and as a nurse in the psychiatric department of a hospital.
Her first novel, Eric Brighteyes #2: A Witch's Welcome, published in 1979 under the pseudonym Sigfriour Skaldaspillir, is usually described as a sequel to H. Rider Haggard's novel Eric Brighteyes, based on Old Icelandic tales; in fact, it is a narrative of the same plot as Haggard's novel, but written from the point of view of the sorceress Swanhild, the opponent of Haggard's hero Eric, who no longer appears as a wicked witch, but as a woman with understandable motives and goals.
Her second novel, The Demon of Scattery (1979), was written in collaboration with the well-known SF author Poul Anderson.
The two protagonists are at the same time incarnations of Celtic deities who, like the Irish of the present, are engaged in a never-ending quarrel with each other.