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As we know, the Battle of Covadonga, won by the Asturias, is seen as the founding stone of the future Reconquista of Ibéria by the Christians.
Some info: http://en.wikipedia.org/wiki/Battle_of_Covadonga
But... what if Pelájo and his Asturians lost? Would this stop, or delay the Reconquista? Would it not change entirely?
EDIT: Pelajo can die and live, though, considering the low numbers, I find it hard for him to survive such battle.