Jonathan Riley-Smith, The First Crusaders, 1095–1131 (Cambridge University Press, 1997), 93, 206, lists him among those who "certainly, or nearly" certainly took part in the First Crusade.
Jonathan Riley-Smith, The First Crusaders, 1095–1131 (Cambridge University Press, 1997), 93, 206, τον κατηγοριοποιεί μεταξύ αυτών που "σίγουρα ή σχεδόν" βέβαια έλαβαν μέρος στην Α΄ Σταυροφορία.