Protestant Ulster-Scotsman Edward Moore (b. c. 1612), had a son born in London named Thomas Moore (b. 1654) who, abjuring his Anglicanism, married in 1690in Quebec City, a Catholic French-Canadian woman named Jeanne Lemelin. In The Origins of Thomas Moore, the reader will be taken back in time to proceed along a path that the ancestors of ThomasMoore would have taken. My sound and reasonable theory will illuminate the history which was taking place throughout the years and, with the help of genetic genealogy, show the evolution of this Moore family who ended up as French Canadians along the St. Lawrence River Valley ofCanada.