When Alfonso, deposed by his brother, Sancho II of Castile, returned to power in Castile as well Leon, he took on many of Sancho's retainers, including one Rodrigo Diaz (d. 1099). Rodrigo came to fall out of favor and in 1081 became a mercenary, fighting for both Christians and Moslems. After taking Valencia in 1094, he passed into legend as "El Cid", interestingly an Arabic title, Sid, "lord, master."
1063
Battle of Graus (Menendez, 1934). During the spring Ramiro I of Aragon besieges Muslim Graus in Zaragozan territory. The Emir Al-Muktadir of Zaragoza leads his army north accompanied by a Castilian contingent under Prince Sancho (the future Sancho II). Rodrigo Diaz de Vivar (later known as "El Cid") is probably in the Castilian contingent. The opposing armies meet and after a protracted struggle Ramiro I is killed and the Aragonese flee (8 May).
1067
The Castilian army under Sancho II and the Alferez Rodrigo Diaz de Vivar - already known as "El Cid" by this time - besiege Zaragoza (Menendez, 1934). The siege is lifted after Emir Al-Muqtadir pays a large ransom and promises tribute.
1068
The Battle of Llantada was arranged to be fought on 19 July by the banks of the Pisuerga River on the boundary between Leon and Castile (Menendez, 1934). The Castilians under Sancho II and Rodriego Diaz defeat the Leonese and Alfonso flees.
1072
Battle of Golpejera (early Jan) (Menendez, 1934). Sancho II of Castile defeats his brother, Alfonso VI of Leon over the Carrion River (9 miles south of the city of Santa maria de Carrion - the capital of the Beni-Gomez - Christian counts of Saldana, Liebana, Carrion, and Zamora). The battle starts at dawn and after a hard fight the Castilians are driven from the field. Rodrigo Diaz de Vivar manages to encourage both King and army, and leads them in a new attack the following morning.
1079
Battle of Cabra. Rodrigo Diaz, defeats the Emir Abd Allah of Granada, who was helped by the Castilian Count Garcia Ordonez.
1082
Battle of Almenar (Menendez, 1934). Rodrigo Diaz "El Cid" de Vivar, leading the army of Al-Mutamin of Zaragoza, defeats a combined army of the kings of Valencia (Al-Mundhir), Lerida (Al-Hayib), Aragon (Sancho Ramirez) and the Count of Barcelona (Berenguer Ramon II - who is captured).
1084
The Muslim army of Zaragoza under El Cid defeats the Aragonese.