Short answers, pulled from the story.
The Gutones, a people believed to have their origins in Scandinavia, migrated southeastwards into eastern Europe. By the middle of the third century AD, they were the most formidable military power beyond the lower Danube frontier.
In 410, Alaric's troops entered Rome through the Salarian Gate and sacked the city. This event severely shook the Empire's confidence, especially in the West.
In 507, the Franks under Clovis I defeated the Visigoths in the Battle of Vouillé and wrested control of Aquitaine. King Alaric II was killed in battle and the center of Visigothic rule shifted from Barcelona to Toledo.
King Reccared convened the Third Council of Toledo to settle religious disputations related to the conversion from Arianism to Catholicism. When Reccared I converted to Catholicism, he sought to unify the kingdom under a single faith.
The Visigothic Code of Law was set in writing in the year 654 by King Chindasuinth. This book survives in two separate codices preserved at el Escorial in Spain.
The kingdom survived until 711 when King Roderic was killed while opposing an invasion from the south by the Umayyad Caliphate in the Battle of Guadalete. A Visigothic nobleman named Pelayo defeated the Umayyad forces in the Battle of Covadonga in 718 and established the Kingdom of Asturias.