Archibald Ross Lewis (1965), The Development of Southern French and Catalan Society, 718–1050 (Austin, University of Texas Press), 122. These "sons" are sometimes referred to as "grandchildren", even by Lewis, see p. 221. Isarn is also sometimes recorded as one of the youngest two sons of Raymond, which would reserve the succession in Ribagorza, then overrun by Moors, to the more capable elder two.
