カルロ・エマヌエーレ1世
Born in Turin, Thomas was the youngest of the five legitimate sons of the sovereign Duke Charles Emmanuel I, Duke of Savoy by his consort Caterina Micaela of Austria, a daughter of King Philip II of Spain and the French princess Elisabeth of France. His mother died the following year. While still a young man, Thomas bore arms in the service of the king of Spain in Italy.