What is the origin of Svengali?
Two terms survive from George du Maurier’s novel Trilby (1894). The first is Svengali, the evil musician who hypnotizes, controls, and exploits Trilby O’Ferrall, a young Irish girl, and makes her a great singer who is unable to perform without his help. In the stage version of the novel, the actress who played Trilby wore a sort of soft felt hat with an indented crown, now called a trilby or trilby hat. The trilby is now commonly mistaken for a different hat, the fedora. Svengali in its extended sense of “a person who completely dominates another, usually with selfish or sinister motives” is recorded by the early 1900s.