Some of the earliest archaeological evidence of Marian devotion in Zaragoza is found in Christian tombs dating from Roman days, which appear to bear images representing the Assumption of the Blessed Virgin. In the 4th century, the presence of votive images placed on columns or pillars is attested. The oldest written testimony of devotion to the Blessed Virgin in Zaragoza is usually identified as that of Pedro Librana in 1155. There is evidence that the site attracted pilgrims from across the Iberian Peninsula during the 13th century, e.g. reflected in the work "Milagros de Nuestra Señora" by Gonzalo de Berceo, dated to the 1250s or early 1260s. The appellation "Santa María del Pilar" is attested for 1299.