No Christian Kingdoms in Iberia?

Al Andalus spread across most of Iberia as we all know, and even into some parts of Southern France.

But there were always the few Christian Kingdoms that remained in Northern Spain, who would eventually, retake the lands from the Muslims and form the Kingdom of Spain.

I do not know a lot about this time period. But just going by geography, I assume that the Catholic Kingdoms used the mountains of Northern Spain to fend of the Islamic forces.

How could, if at all possible, Al Andalus come to control all of Iberia, with no Christian leaders left in the region? Could this be enough to prolong the existence of Al Andalus, maybe even giving them enough time to centralise to a greater extent and survive into the modern day?
 
The mountains not only made those lands easier to defend. They also made those lands totally unatractive for the muslims due to the lack of economical incentive.
 
Don Pelayo (Pelagius of Asturias) loses the Battle of Covadonga disastrously, and the Umayyads complete the conquest of northern Iberia. While a Frankish incursion into OTL Catalonia is still rather likely, this will defeat the last independent Christian power within Spain and avert the Reconquista as we know it.

https://en.wikipedia.org/wiki/Battle_of_Covadonga
 
The problem with Covadonga is that it was as much an skirmish and not the epic battle the christian chronicles tell. The most you can expect are punitive expeditions and some form of vasaliage, but the Ummayids had no reasons to take the trouble of goverbing those areas.

On the other hand, anotther key factor sparking the christian expansion towards the south has too do with Ummayids internal politicas and the ethnic tensions inside the invading forces that led to the berber rebellion, which was a main factor in the defeat of Poitiers and thatbled to the valey of the river Duero/Douro to become almost depopulated and defenseless when the berbers retourned to North Africa.
 
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