Bodybuilder and strongman who became the first ever competitor to win the World's Strongest Man competition on four separate occasions.
He started bodybuilding and weightlifting at a very early age in his home country of Iceland.
He died from a heart attack while working out at the gym.
He had one child, Sigmar Jonsson.
In his first World's Strongest Man competition he placed in second, behind only legend Geoff Capes.