The mother of Tancred was Emma, sister of the great Robert Guiscard; his father, the Marquis Odo the Good. It is singular enough, that the family and country of so illustrious a person should be unknown; but Muratori reasonably conjectures that he was an Italian, and perhaps of the race of the marquises of Montferrat in Piedmont, (Script. tom. v. p. 281, 282.)