See A Monster at the Top of the Tree by Kathleen Menhinick Dewey pp 35-37 for Ursula Dobyns and Mark Cottle. This book traces its author's ancestry back through early English kings, back through Charlemagne, to Merovech, younger son of Clodio and his queen. Merovech, according to legend, was the result of a union between the queen and a sea monster. Thus the monster at the top of the family tree. Since virtually every European is descended in some way from Charlemagne, just about anyone who is fully successful in tracing his ancestry will find the same legendary monster at the top of his family tree. However, in the book, the line traced back to the monster is not the Dobyns line.
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