https://www.smithsonianmag.com/history/little-known-role-slavery-viking-society-180975597/?utm_source=smithsoniandaily&utm_medium=email&utm_campaign=20200825-daily-responsive&spMailingID=43294861&spUserID=OTE5NDcwNzM1NjY3S0&spJobID=1822053449&spReportId=MTgyMjA1MzQ0OQS2