Dionysus was a Swedish/German power metal band formed in 1999 by Sinergy drummer Ronny Milianowicz and disbanded in 2008.
Dionysus debut album Sign of Truth was recorded at the Rhön Studio in Fulda, Germany in 2002, which is best known for its productions with Edguy and Avantasia.
In January 2007 co-founder, songwriter and drummer Ronny Milianowicz suddenly decided to quit the band for other engagements, though promising Dionysus support for all live activities of 2007.
On 20 February keyboardist Kaspar Dahlqvist announced that he was leaving due to personal conflicts and he would not be participating in the upcoming tour.
In 2008, bassist Nobby Noberg and former drummer Ronny Milianowicz had their first release with their new band Saint Deamon, including singer Jan Thore Grefstad.