LA ROCHE DE MESGOUEZ, TROILUS DE, Marquis de La Roche-Mesgouez, in Brittany, viceroy of New France, founder of the outpost on Sable Island in 1598; baptized 30 June 1536 at Landerneau, France, son of Guillaume de Mesgouez and Françoise Lampyer; d. 1606 in France.. At 13 La Roche was a page at the court of Henri II. Subsequently, having won the favour of Catherine de Médicis, he was in turn ...