Fortress is a series of fantasy novels by science fiction and fantasy author C. J. Cherryh, published by HarperCollins. They are set in a medieval fantasy world with a 15th-century feel and feature magic, sorcery, medieval warfare, politics and other elements common to the high fantasy subgenre. The first book in the series, Fortress in the Eye of Time, was published in 1995 and followed by Fortress of Eagles in 1998, Fortress of Owls in 1999, Fortress of Dragons in 2000 and Fortress of Ice in 2006.