 Berta had died without giving him an heir at the end of 1099; shortly after Alfonso married Isabel who gave him two daughters, but no sons.To further complicate the situation, in March 1105 his grandson Alfonso Raimúndez, son of Urraca and Raymond of Burgundy, was born, a possible contender to the throne in detriment to Sancho Alfónsez, the king's son with Zaida.Montenegro thinks that Alfonso VI legitimized Sancho probably coinciding with the meeting of a council in Carrión de los Condes in January 1103 because from that date onwards, Sancho began to confirm royal charters before his brothers-in-law Raymond and Henry of Burgundy.