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Description
the Caliphate of Cordoba, a successor state in Iberia to the Visigoth Kingdom, was home to a center of culture and learning. A single Visigoth lord would establish a northern kingdom of Asturias, and many years later the Reconquista would begin.
In the case of the Caliphate of Cordoba / Al'Andalus, I decided for there to be a different Visigoth successor state, in the form of Narbonne (named for Narbonensis, a state in the long-gone Roman Empire), the main language of which would become known in OTL as Catalonian, though in this world as Narbonian.
Meanwhile, some Basque peoples would feel closed in and hostile, pressured to convert from their religious practices to that of Islam. They would fall under the leadership of a Frankish royal family, the Angevins, who would go on to expand their kingdom (initially a small duchy) into a worthy rival for both France and Al'Andalus, and their relatively isolated language would evolve and borrow words from the surrounding French, Narbonian and Mozarabic, though not enough to be unrecognizable as Basque (or, i suppose, Vasconian)
the Byzantine Empire would, of course, later reconquer regions of northern Africa. Seeing the religious and cultural harmony that many in Al'Andalus experienced, the Byzantines would endorse similar hierarchical policies and taxing systems of the Andalusians.
I also had another kingdom, Arelat (otherwise known as the Burgundian Kingdom), remain a thing leading up from the 710s all the way into the 1300s. It was initially Middle Francia before being absorbed by the Holy Romans, and the western Franks had their hands full with the Vasconians to the south and the English and Danish raiders to the north. 'Middle Francia' eventually became Arelat, otherwise known as Burgundia to Romance-language speakers. the Holy Roman Empire would give many of their smaller duchies and parishes to Arelat's royal dynasties as a way to pay off debts or sew alliances, though this only led to a faster and faster fall to the HRE's territory over time in their northern holdings, in the Frisiosaxon regions. Arelat, initially a kingdom that did speak largely Romance languages at first, quickly became German-speaking, though formed a completely new central-northern dialect (Flaschland Deutsch, later Arelatian cir. 1550ish) rather than those along the highlands and the Alps (Platte Deutsch, later Baire-Allemagnian cir. 1550ish)
the Franks meanwhile, lost their germanic language to a romance tongue, in this timeline unscathed by the English Angevins (because the Angevins are Basque in this timeline) and so sound like a normal fucking language, and not like someone with wire retainers trying to talk with a sinus infection.

Description
the Caliphate of Cordoba, a successor state in Iberia to the Visigoth Kingdom, was home to a center of culture and learning. A single Visigoth lord would establish a northern kingdom of Asturias, and many years later the Reconquista would begin.
In the case of the Caliphate of Cordoba / Al'Andalus, I decided for there to be a different Visigoth successor state, in the form of Narbonne (named for Narbonensis, a state in the long-gone Roman Empire), the main language of which would become known in OTL as Catalonian, though in this world as Narbonian.
Meanwhile, some Basque peoples would feel closed in and hostile, pressured to convert from their religious practices to that of Islam. They would fall under the leadership of a Frankish royal family, the Angevins, who would go on to expand their kingdom (initially a small duchy) into a worthy rival for both France and Al'Andalus, and their relatively isolated language would evolve and borrow words from the surrounding French, Narbonian and Mozarabic, though not enough to be unrecognizable as Basque (or, i suppose, Vasconian)
the Byzantine Empire would, of course, later reconquer regions of northern Africa. Seeing the religious and cultural harmony that many in Al'Andalus experienced, the Byzantines would endorse similar hierarchical policies and taxing systems of the Andalusians.
I also had another kingdom, Arelat (otherwise known as the Burgundian Kingdom), remain a thing leading up from the 710s all the way into the 1300s. It was initially Middle Francia before being absorbed by the Holy Romans, and the western Franks had their hands full with the Vasconians to the south and the English and Danish raiders to the north. 'Middle Francia' eventually became Arelat, otherwise known as Burgundia to Romance-language speakers. the Holy Roman Empire would give many of their smaller duchies and parishes to Arelat's royal dynasties as a way to pay off debts or sew alliances, though this only led to a faster and faster fall to the HRE's territory over time in their northern holdings, in the Frisiosaxon regions. Arelat, initially a kingdom that did speak largely Romance languages at first, quickly became German-speaking, though formed a completely new central-northern dialect (Flaschland Deutsch, later Arelatian cir. 1550ish) rather than those along the highlands and the Alps (Platte Deutsch, later Baire-Allemagnian cir. 1550ish)
the Franks meanwhile, lost their germanic language to a romance tongue, in this timeline unscathed by the English Angevins (because the Angevins are Basque in this timeline) and so sound like a normal fucking language, and not like someone with wire retainers trying to talk with a sinus infection.