[1] He competed in the light heavyweight event at the 1912 Summer Olympics.
[2] Sigurjón later became an industrialist: by 1946, he was the owner of a textile factory at Álafoss just outside Reykjavik.
He also took a keen interest in Icelandic culture and psychic research.
He concluded that the remains of Jónas should be brought from Denmark, where he died, to his birthplace in Iceland.
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