Along with his brothers Rodrigo, Pedro, Nuño, and Álvaro, he took part in the Battle of Navas de Tolosa which occurred on 16 July 1212.
[4] By the end of May the situation in Castile had become dangerous for Berengaria, so she decided to take refuge in the castle of Autillo de Campos, a property of Gonzalo Rodríguez Girón, and sent her son Fernando to the court of León and his father, King Alfonso IX.
Circumstances changed suddenly when King Henry died on 6 June 1217 after receiving a head wound from a roof tile that came loose accidentally while he was playing with other children in the palace of the Bishop of Palencia, Tello Téllez de Meneses.
[6] Immediately, Berengaria charged Lope Díaz de Haro, Gonzalo Rodríguez Girón, and Alfonso Téllez de Meneses with the task of discreetly fetching her son Ferdinand, who at the time was in Toro with his father King Alfonso, using as pretext the possibility of an attack on Autillo and without revealing the news of her brother's death.
Berengaria, the legitimate heiress to the throne of Castile, renounced it in favor of her son Ferdinand, who shortly thereafter was proclaimed king in Autillo de Campos on 14 June 1217.
[10] Gonzalo Rodríguez Girón consolidated his position after the kingdom was once again at peace and the threat posed by Count de Lara and his brothers had faded away.
However, a recent survey of the Lara by Antonio Sánchez de Mora dismisses this connection as being without basis, a deliberate attempt to give the Girón prominent ancestry.
The children of the first marriage were:[15] Around May 1213, Gonzalo married, for the second time, Marquesa Pérez, who may have come from the Villalobos or the Manzanedo family, although her parentage has not been confirmed.