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In page Family of Vladimir the Great:

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Norse sagas mention that, while ruling in Novgorod in his early days, Vladimir had a Varangian wife named Olava or Allogia. This unusual name is probably a feminine form of Olaf. According to Snorri Sturluson the runaway Olaf Tryggvason was sheltered by Allogia in her house; she also paid a large fine for him.[citation needed]