[1][2] As his father had acquired the lordships of Hita and Uceda during his marriage to Estefania, they passed to Martín on his death in 1125.
[6] Martín may have served as the vicar of his half-brother, Gutierre Fernández de Castro, in Calahorra between 1139 and 1151.
Martín was wounded in the fighting but managed to retreat with his men, while Muño was trapped and killed.
[4][11] In the Poema de Almería, he is the subject of lines 244–250:[12][13]Martín, the son of Fernando, orders all the arms to be requisitioned from the houses.
He has armed handsome young men with resplendent weapons.Martín's camp resounds with a youthful tumult.
[4] Martín was present as a witness when Alfonso VII made a donation to his sister, Urraca Fernández, on 3 February 1148.