He had good relations with King Alfonso VI of León and Pope Gregory VII, both of whom took his side when he was involved in a dispute with his brother.
Alfonso promised to give García the archbishopric of Toledo with an endowment capable of supporting one thousand knights.
[a] The historian Ramón Menéndez Pidal believed that García, Sancho and Alfonso reconciled at the siege of Zaragoza.
[4] In a letter to Gregory, García fabricated the story of his father submitting his kingdom to the Papacy and promising an annual tribute.
The reason for García's calumny—which implied that his brother had not upheld Ramiro's tributary obligation—are unknown, but it was treated as fact by Gregory.
Documents confirm that García was abbot of Leire in 1079–80, the last bishop of Pamplona to hold this abbatial office at the same time.
[7] By 1082, during his dispute with Sancho, the king gave the administration of the diocese and its revenues to their sister, Sancha, wife of Count Ermengol III of Urgell.