Editing Alfonso VI of León and Castile (section)

===Succession crisis===
Alfonso VI, already old, had to deal with the problem of his succession.{{Sfn|Reilly|1992|pp=95–96}} 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.{{Sfn|Reilly|1992|p=96}} To further complicate the situation, in March 1105 his grandson [[Alfonso VII of León|Alfonso Raimúndez]], son of Urraca and Raymond of Burgundy, was born,{{Sfn|Reilly|1992|p=96}} a possible contender to the throne in detriment to Sancho Alfónsez, the king's son with Zaida.{{Sfn|Reilly|1992|p=96}} 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.{{Sfn|Montenegro|2010|pp=377 and 383}} In May 1107, Alfonso imposed the recognition of Sancho as heir, despite the probable opposition of his daughters and sons-in-law,{{Sfn|Reilly|1992|p=96}} in the course of a ''Curia Regia'' held in León.{{Sfn|Montenegro|2010|pp=387}} The situation improved for the king with the death of Raymond of Burgundy in September and the agreement with Urraca so that she remained as sovereign Lady of Galicia,{{Sfn|Martínez Díez|2003|p=172}} except in the case of remarrying since, in that case, Galicia would pass to her son.{{Sfn|Reilly|1992|pp=96–97}}

The death of Sancho in the Battle of Uclés on 29 May 1108 left Alfonso VI without his only male heir. He then chose his eldest legitimate daughter Urraca as his successor, but decided to marry her to his rival and famous warrior King [[Alfonso the Battler|Alfonso I of Aragon and Navarre]] in the autumn of 1108.{{Sfn|Reilly|1992|p=97}} Although the marriage was celebrated at the end of the following year, it did not lead to the expected stability, but to a long civil war that lasted eight years.{{Sfn|Reilly|1992|p=98}}