 Two preserved diplomas of Santa María la Real de Irache also put Gonzalo ahead of him.On the basis of these documents, Gonzalo Martínez Díez places Ferdinand third of the known legitimate sons of Sancho III (Ramiro being a bastard born before Sancho's marriage to Muniadona), and his birth no earlier than 1015.The "Crónica de Alaón renovada", which Martínez Díez dates to 1154, but which other scholars dismiss as a late medieval concoction, lists García, Ferdinand and Gonzalo as Sancho III's sons by Muniadona in that order, but in the same passage mistakenly places Gonzalo's death before his father's.