The First Lady's great-great-great-grandmother, a slave called Melvinia, was made pregnant in 1859 at the age of about 15 by Charles Shields, one of her owners' sons, according to a comprehensive new book.

Shields, who was about 20 at the time, was a descendant of Andrew Shields, a protestant Irish immigrant who fought against the British in the American revolutionary war in the late 18th century.

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