Cid's Spain © Mark Wade

River, and region, of which Diego Sanchez was the count. The area is dotted with pre-Roman castro fortifications, and a number of important medieval castles and towns from the Cid's time.

These include Covarrubias (site of an annual medieval festival in July), the monastery of San Pedro de Arlanza, the castles at Sala de los Infantes, Latitude: 42.66813. Longitude: -6.41942.

• Book IX Chapter I:

  And there went fifty with Martin Garcia and Martin Salvadorez, and fifty with Pero Gonzalvez and Martin Munoz, and Diego Sanchez of Arlanza went with fifty, and Don Nuno, he who colonized Cubiella, and Alvar Bermudez he who colonized Osma, went with forty, and Gonzalo Munoz of Orbaneja, and Muno Ravia, and Yvanez Cornejo with sixty, and Muno Fernandez the Lord of Monteforte, and Gomez Fernandez he who colonized Pampliego with sixty; and Don Garcia de Roa and Serrazin his brother, Lord of Aza, with ninety; and Antolin Sanchez of Soria took with him forty knights who were his children or his kin:...nine hundred knights were they in all.