Have you read the "Genealogical History of the Family Semple from 1214 to 1888"? Available from Amazon Canada. If you can trace your ancestors back to these Semples, then you can probably also trace back to English and Scottish royalty. My book on the history of the Semples/Sempills will be available soon through Amazon: "The Semples/Lord Sempills of West Scotland: family and contextual history from 11th to 19th Centuries".