The Fortissimus is a defunct event in strength athletics. The name means "the mightiest" and was a multi-event challenge at the end of which the winner is crowned as the "Strongest Man on Earth". It was set up to bring together the strongest competitors on the planet independent of the organizations to which they were signed, and also as a tribute to the nineteenth-century Canadian strongman Louis Cyr, which gave it many similarities to Le Defi Mark Ten International which last took place in Canada in the early 1990s. After its first airing in 2008, the strength athletics magazine Milo described it as the ultimate strongman competition ever held. Despite a successful edition in 2009, a reported lack of a major sponsor for 2010 resulted in the competition being suspended. A 2020 revival was postponed due to the Covid19 pandemic.