At the time the Saracens descended on what is now Spain it was occupied by the Visigothic Kingdom under King Roderick. And who were the Visigoths? They were Swedes with a severe case of wanderlust.
The Goths originated in southern Sweden, from the area where the historic provinces of Gotland, Östergötland, and Västergötland (whence my grandmother came) are situated. During the Folkvandring (wandering of peoples = Migration Period) they got itchy feet and took off in a generally southeasterly direction, ending up in the Pannonian Plain (see the map, below).
There, they split into two major bands the Ostrogoths (Eastern Goths) and Visigoths (Western Goths), which has nothing to do with Östergötland, and Västergötland! Some of the Ostrogoths crossed the Black Sea into Anatolia. Others, and the Visigoths, wandered back westward into the main part of Europe.
In AD 410, the Visigoths, under their King, Alaric I, sacked Rome, where, in AD 493, the Ostrogoths under Theoderic would establish the Ostrogothic Kingdom of Italy.
Having despoiled the Eternal City, the Visigoths moved on into Hispania. Here, they defeated the Vandals and the Suebi and established their own Kingdom.
Originally converted to the Arian heresy by Ulfilas, they accepted Nicene Christology around AD 589, under King Reccared I, thus becoming the first Swedes to become Catholic!
So, in AD 711, when the jihad invaded the Iberian Peninsula, it was largely controlled by Swedes, 400 plus years removed from Sweden!
And, that's how the Swedes started the Reconquista!