If authentic, they place Ferdinand's birth before that date. In five documents of the monastery of San Salvador de Leire, Ferdinand is listed after Gonzalo. One charter from Pamplona, dated 29 September 1023, is witnessed by Sancho's mother, Jimena Fernández, his wife Muniadona, her children, listed García, Ferdinand then Gonzalo, and their brother, the illegitimate Ramiro.

Three documents from the Cathedral of Pamplona list them in this way, as well as four from the monastery of San Juan de la Peña. Most, and the most reliable, charters name Sancho's sons in the order Ramiro, García, Gonzalo, then Ferdinand. He was certainly a younger son, and he was probably born later than 1011, by which date his parents are known to have married. There is some disagreement concerning the order of birth of Sancho III's sons, and of Ferdinand's place among them. Nevertheless, 'he internal consolidation of the realm of León–Castilla under Fernando el Magno and Sancha (1037–1065) is a history that remains to be researched and written.' Date and order of birth While Ferdinand inaugurated the rule of the Navarrese Jiménez dynasty over western Spain, his rise to preeminence among the Christian rulers of the peninsula shifted the focus of power and culture westward after more than a century of Leonese decline. He was a younger son of Sancho III of Navarre and Muniadona of Castile, and by his father's will recognised the supremacy of his eldest brother, García Sánchez III of Navarre. According to tradition, he was the first to have himself crowned Emperor of Spain (1056), and his heirs carried on the tradition. 1015 – 24 December 1065), called the Great ( el Magno), was the count of Castile from his uncle's death in 1029 and the king of León after defeating his brother-in-law in 1037.

The story of ferdinand 1936