Martín was the son of Lope I Díaz de Haro but his mother is unknown. The date and place of his birth have not been found.
Martín López de Haro
Lope I Díaz de Haro (c1105-1170)
Diego I (III) López de Haro (c1075-1124)
Lope Íñiguez (c1050-1093)
Ticlo Díaz
María Sánchez
Sancho Sánchez
Elvira García