Burke's Peerage indicates that the parent of William Sinclair is Robert Sinclair, a Norman, and not Henry Sinclair of Rosslyn as much of the Rootsweb information on the internet states. However, according to Burke's Peerage, William did marry Amicia daughter of Henry de Roskelyn, lord of Roslin/Rosslyn and was given charter to Rosslyn by Alexander II of Scotland. This puts the name of the entire ancestry of Henry in doubt, but I assume that the persons are the same and may have been known as Sinclair or "de Roskelyn" or both, and may have descended from St Clair, Normandy, because apparently some sources support that scenario. Thus I am keeping the same ancestry for Henry de Roskelyn, father-in-law of William, that many people have for Henry Sinclair, father of William.
Father: Henry SINCLAIR , of Rosslyn b: ABT 1192 in Rosslyn Castle, Roslin, Midlothian, Scotland
Mother: Katherine of STRATHEARN b: ABT 1197 in Strathearn, Perthshire, Scotland
Marriage 1 Margaret of MAR b: ABT 1220 in Mar, Aberdeenshire, Scotland
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