Around 1150. However, El Cid and independent Valencia were long gone by then.
The problem lies in the fact that only if we do the "What if" and his son is still alive and defeated the moors so far, because El Cid's eldest duaghter married a noble whose son became King of Navarra, and his second daughter married the count of Barcelona, whose descendants were only daughters. The only paths to continue the lineage of El Cid is either:
1. Diego Rodriguez actually surviving his battle of Consuegra, succeeding after El Cid dies, and keeping the Muslims at bay, while conquering the Baleares. But most probably by 1150 he too would have already died. To follow this line you would have to invent a son of Diego Rodriguez
2. His wife succeeding him as historically happened, keeping the moors at bay and conquering the Baleares, then using the Semi-Salic succession law to get the historical elder male descendant from El Cid traceable through females, making him descendant of El Cid through his mother (Jimena, granddaughter of El Cid, second daughter of Maria and Ramon Berenger III of Barcelona, married to Bernard III of Foix) and his grandmother (Maria, second daughter of El Cid, married to Ramon Berenger III of Barcelona). He is Roger Bernard I, Count of Foix. He was 18 years old in 1150 and therefore able to be "King of Valencia".
The Almoravids ruled Morroco, Fez and Al-Andaluz. The Hammadids ruled Algiers and Tunis. The Almohads came from the Atlas Mountains (Within Morroco) and defeated the Almoravids in Morroco, then defeated the Hammadids, thus ruling Morroco, Fez, Algiers, Tunis and Al-Andaluz.
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