The founder members of the band were bassist Neil Marshall (born Neil Martin Marshall, in June 1944, in Carlisle, Cumberland), lead singer Mike Gillen, lead guitarist Frank Kenyon (born 12 October 1945, in Carlisle) and Terry Sims on drums. All had been in The Square Chex formed in 1965 with Gillen on lead vocals, Jimmy Wyllie on bass, Danny Little on drums, Ray 'Smokestack' Parr on lead guitar and Ian 'Mel' Meldrum on drums. Terry Sims replaced Little and Meldrum, Frank Kenyon (ex The VIP's) replaced Parr and Neil Marshall (ex The Street) replaced Wyllie in 1967. The band changed their name to Mythology in early 1967. Gillen left in December 1967 after a short tour of Europe and was replaced by a Newcastle singer called Rob. A week later Kenyon left. In January 1968, former members of The Rest, Tony Iommi (born Frank Anthony Iommi, 19 February 1948, Aston, Birmingham, Warwickshire) and Chris Smith (born Christopher Robin Smith, 1949, Erdington, Birmingham) replaced Kenyon and Rob on lead guitar and lead vocals respectively. Bill Ward, also formerly of The Rest, replaced Sims on drums in mid February 1968. Ward made his debut with the band on 17 February 1968 at the Globe Hotel in Main Street, Cockermouth, Cumberland. On 30 April 1968, the band supported The Move at the 101 Club in Carlisle and on 4 May 1968 they supported Gary Walker and the Rain at the Clockwork Orange in Chester, Cheshire.
Mythology had some regional success but eventually disbanded after an incident where all four members were arrested and fined 15 pounds for possession of cannabis resin on 27 May 1968. Much of their gigging work dried up after this event, and they soon disbanded after the final show at the Queen's Hotel, in Silloth on 13 July 1968.
After the dissolution, Ward and Iommi, along with Ozzy Osbourne and Geezer Butler, founded a new band, the Polka Tulk Blues Band, later called Earth and finally renamed Black Sabbath.