The Visigoths were the western Goths, the Ostrogoths being the other, who made up the two main tribes of Germanic peoples who sacked Rome. They first appeared in history around 268. The Visgoths were important in western European affairs for about 3 centuries after they sacked Rome. They settled in the lands now called Spain and southern France.
They were Ariansim Christians who believed that Jesus was not an aspect of God in the Trinity, but a separate being created directly beneath God. The Iberian Visigoths adhered to Arianism until 589 when King Reccared converted his people to Catholicism.
The Goths were not treated well by the Romans.