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In page Swedish slave trade:

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Early Swedish history is not well documented and the sources are subjected to much scrutiny, especially since the trustworthiness of the Icelandic sagas is in doubt, since the Swedish monarchs mentioned by foreign sources do not correlate with the monarchs mentioned by Icelandic Sagas. During the Semi Legendary period, a slave revolt is mentioned by the Sagas taking place in Sweden. Its authenticity is unknown.[citation needed]