Field before the walls of Zamora, on the banks of the Rio Duero. Possibly the location of the church Santiago del Burgo indicates that the field was below the jog in the walls on the southeast corner of the city.
On the morrow before the hour of tierce the four and twenty alcades marked out the lists upon the sand beside the river, at the place which is called Santiago, and in the middle of the lists they placed a bar, and ordained that he who won the battle should lay hand on the bar, and say that he had conquered: and then they appointed a term of nine days for the combatants to come to those lists which had been assigned.
As soon as King Don Alfonso arrived at Zamora, he pitched his tents in the field of Santiago, and took counsel with his sister.