alfsaga:

In the days before the forging of Mjollner, Thor was renowned as a slayer of Jottuns, 
unmatched by Vanir, Ettin or troll in battle or in duel. He was ever alone. 
While Odin had sweet Frigga for his own, and Loki the seducer had two wives and many mistresses, 
Thor himself had found no goddess, elf, or mortal to win his heart. 
In those days none was more travelled than Loki, for he alone ranged at will in places held by god or Jottuns both. 
When Thor sat in his hall brooding over his troubles, Loki teased him, seeking to learn his troubles.

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