The story concerns a feud between two families, the Ashtons and the Ravenswoods. When the opera begins, the Ashtons are in the ascendancy and have taken possession of Ravenswood Castle, the ancestral home of their rivals. Edgardo (Sir Edgar), Master of Ravenswood and last surviving member of his family, has been forced to live in a lonely tower by the sea, known as the Wolf's Crag. The Ashtons, despite their success, are threatened by changing political and religious forces. (Wikipedia)