From Ohio History Central
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<p>Marmaduke van Sweringen was a real person. According to a family Bible, he was born in 1763, which means that the Shawnees may have captured him during the American Revolution. There is no doubt, however, that Blue Jacket was born during the early 1740s, approximately two decades before van Sweringen. Blue Jacket emerged as a powerful leader of the Shawnees during Lord Dunmore's War in 1774. At this point, van Sweringen would have been only eleven years of age. Van Sweringen was supposedly captured when he was a grown man. At the age of seventeen years, he would have a firm grasp of the English language. It is well documented that Blue Jacket did not know English and had to rely on interpreters during his negotiations with whites. </p>
<p>Many people who believe that van Sweringen was Blue Jacket point to the Shawnee chief's children, who purportedly were of mixed heritage. There is no doubt that Blue Jacket's children were partly white. Blue Jacket's wife, Margaret Moore, was a white woman and a Shawnee captive. Historical documents refer to the couple's children repeatedly as "half breeds" or "half bloods." If Blue Jacket was white and his wife was white, these terms, in all likelihood, would not have been used to describe the couple's children. </p>
<p>It is also important to note that the first claims that Blue Jacket was a white man did not emerge until the late 1870s, approximately seventy years after the chief's death. None of Blue Jacket's historical contemporaries ever claimed that the Shawnee leader was a white man.
</span></p><p>Results of DNA testing of Blue Jacket and van Sweringen heirs published in 2006 showed no relationship between the families tested. </span></p>