Following his expulsion from the Acolytes, Fabian Cortez traveled to Genosha, leading a mutate rebellion against the country's human population.  The Unforgiven were Cortez' personal bodyguards.  Following a defeat at the hands of the X-Men and Cotez' defeat at the hands of Exodus, the Unforgivnen alligned themselves with Exodus.  The team hasn't been heard from since.