Apparently the term "group of death" was first used at the 1970 World Cup by Mexican journalists (using the Spanish phrase "Grupo de la Muerte") to describe the difficulty of the tournament's Group 3, which featured England (the reigning World Cup champions), Brazil (the pre-tournament favourites) and tricky East-European opponents Czechoslovakia (runners-up in 1962) and Romania.
Up to the 1992 tournament, there were never more than two groups at the European Championships finals, so our list starts with Euro 96, the first European Championship tournament to feature 4 groups.
Euro 2000 in Belgium and the Netherlands was unique in Group of Death history as the media couldn't decide which was the hardest group, between Group A and Group D.
Group A featured reigning champions Germany along with highly-fancied Portugal, a rejuvenated England, and a talented Romanian side.
Group D looked equally daunting, with co-hosts the Netherlands, France (the World Cup champions and pre-tournament favourites), the Czech Republic (runners up in 1996) and Denmark.