Therion is a Swedish symphonic metal band founded by Christofer Johnsson in 1987. Its name, meaning "Beast" in Greek, was inspired by the Celtic Frost album To Mega Therion. Originally a death metal band, Therion adjusted its musical style by adding orchestral elements, including choirs, classical musicians, and even a full orchestra at their concert performances. As a result, they are considered pioneers of the symphonic metal genre.