This article is from the Nordic countries FAQ, by Antti Lahelma and Johan Olofsson, with numerous contributions by others.
Not very much, I'm afraid, and we're lucky to know even as much as we
do. For example, most of the ancient poems about pagan deities
(they're the most authentic source of Norse mythology) that survived
to this date are from a certain book called Codex Regius, the only
extant copy of which was rescued in half-rotten condition from an
abandoned Icelandic barn in the 17th century.
 
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