Who was the Norse god of peace and prosperity?

You have greatly mistaken the Viking mentality.

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Whoever answered above doesn't know anything about the Norse.

The Norse god of Peace and Prosperity would be Freyr, of the Vanir, brother to Freya, son of Nordr. His full name would be Freyr Ingvi, as Freyr simply means "Lord." He was also the God of farming and agriculture, along with the forests.

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The Norse god of peace is Baldur