Caligula refers to several bands active or not. (see below for the different bands)
For the Belgian Avantgarde Metal band, see http://www.lastfm.fr/music/Caligula+%28BE%29
1. Caligula were a band from Sydney, Australia, which briefly rose to fame during their 1990-1994 presence on the Australian music scene, combining elements of Australian retro-rock (a style made famous by The Hoodoo Gurus) and grunge with electronic-tinged production.