King Alfonso VII of León had appointed Gutierre's paternal uncle, Gutierre Fernández de Castro, guardian and tutor of his son, Infante Sancho, the future King Sancho III of Castile. It was during the crisis of the regency, exercised by Manrique Pérez de Lara, that Gutierre, with his brothers, Fernando, Pedro and Álvaro abandoned Castile due to their differences with the members of the House of Lara and sought refuge in the Kingdom of León to serve King Ferdinand II, where the four brothers were appointed to relevant posts. Gutierre appears between 1180 and 1186 governing several locations as tenente during different periods. The first of these was Benavente in 1180, in 1182 several regions in Galicia in the area of Toroño and Lemos and Montenegro as well as Villalpando in Zamora, Asturias and Extremadura. His presence is attested in several royal charters from 1186 to 1190 in Castile in the curia regis of King Alfonso VIII. He appears confirming many charters in the court and many donations and other family transactions. The Castro brothers confirmed a donation to the Monastery of Santa María de Retuerta made in 1153 by their mother Elo and her second husband Count Ramiro Froilaz. En 1165, Gutierre and his brother Pedro, with the consent of the other brothers, Fernando, Álvaro and Sancha, donated to the above-mentioned monastery the property they shared in Villam Novam in the valley of the Esgueva River. On 29 March, between 1188 and 1218, Gutierre with his wife Elvira and four of their five children, Fernando, García, Pedro and Sancha, jointly with the children of their mother's first marriage, donated the Monastery of San Félix de Incio with all its estates to the Hospitallers. In March 1181, Countess Sancha Fernández de Traba, daughter of Fernando Pérez de Traba, with her two children, Vermudo and Rodrigo Álvarez gave Gutierre, his wife Elvira and son Álvar some land in Lemos. In 1195, Gutierre is attested in the Monastery of Retuerta with his nephews, Fernando and Elo Álvarez, the children of his sister Sancha Rodríguez and her husband Álvaro Rodríguez de Guzmán.
Marriage and issue
Between 18 September 1172 and 12 July of the following year he married Elvira Osorio, daughter of Count Osorio Martínez and Teresa Fernández de Villalobos, widow of the Galician magnate Nuño Fernández with whom she had two children: Munio and Urraca Núñez. In her will, Elvira asked to be buried at that chapel in the Monastery of Sahagún near her maternal grandmotherElvira Alfónsez, illegitimate daughter of King Alfonso VI of León and his mistress Jimena Muñoz. Gutierre and Elvira were the parents of:
Álvaro Gutiérrez de Castro, mayordomo mayor of the King of León in 1211 and governor of Aliste, Castrotorafe, and Villafáfila, he appears for the last time in a charter dated 8 July 1213.
Sancha Gutiérrez de Castro, the wife of Suero Téllez de Meneses, son of Tello Pérez de Meneses and his wife Gontrodo García. They are the ancestors of the Téllez de Meneses from Toledo.
