 His first expedition against Graus failed, and in 1059 Ferdinand succeeded in extorting "parias" (tribute) from Zaragoza.Ramiro marched on Graus again in the spring of 1063, but this time the Zaragozans had with them 300 Castilian knights under the "infante" Sancho the Strong and (possibly) his general Rodrigo Díaz de Vivar, better known as El Cid.The presence of the Cid at the battle is based on a single source, the generally reliable "Historia Roderici", which alleges that he was the "alférez" of Sancho at the time.