Location of a major monastery, 68 km from Burgos, set in mountainous pine forests. It reached its apogee in the Cid's time, when the court of Castile was here. The town features an interesting old multi-level plaza and the 11th Century San Salvador church
And they summoned all the Bishops, and took the body of the King and sent it full honourably to the Monastery of Ona, and buried him there as beseemed a King: and while one part of the chief men of the host accompanied the body, the rest remained in the camp before Zamora.
The bodies were ransomed, seeing that there was no remedy, the Castle being so strong, and Don Gonzalo was buried in the Monastery of Ona, according as he had appointed in his will; and the Infante Don Sancho with his forefathers the Kings of Navarre, in the royal Monastery of Naxara.