Short answers, pulled from the story.
The Visigoths were a Gothic people who emerged in the Balkans during late antiquity, likely descended from the Thervingi who entered the Roman Empire in 376. Their earlier origins trace to Germanic tribes believed to have come from Scandinavia, who migrated southeastward into eastern Europe and settled north of the Black Sea before moving into Roman territory.
Alaric I led the sack of Rome on the 24th of August, 410, after the western emperor Honorius executed the general Stilicho in 408 and Roman legions massacred the families of thousands of barbarian soldiers. Alaric had been cheated by a Roman faction following an earlier negotiated settlement, and he entered the city through the Salarian Gate in retaliation.
King Reccared I converted the Visigothic kingdom from Arian Christianity to Nicene Christianity at the Third Council of Toledo in 589. The conversion ended a long religious divide between the Gothic ruling class and their Hispano-Roman Catholic subjects, though it also led to increasing persecution of the Jewish population of Hispania.
The Visigothic Code of Law, also called the Liber Iudiciorum or Forum Iudicum, was first promulgated by King Chindasuinth between 642 and 653 and formally issued in 654. It abolished the legal distinction between Goths and Romans, making all subjects of the kingdom hispani under a single jurisdiction. Its protection of the property rights of married women ultimately evolved into the community property system used across much of western Europe today.
The Treasure of Guarrazar is a collection of twenty-six votive crowns and gold crosses from the Visigothic royal workshop in Toledo, discovered at Guadamur in the Province of Toledo. Spanish archaeologists consider it the high point of Visigothic goldsmithery. The crowns of Recceswinth and Suintila are held at the National Archaeological Museum of Madrid, while three crowns and two crosses are in Paris at the National Museum of the Middle Ages.
The Visigothic kingdom collapsed after King Roderic was killed at the Battle of Guadalete in 711, when a Umayyad army invaded from the south. Most of the Iberian Peninsula came under Islamic rule within years. A Visigothic nobleman, Pelayo, defeated the Umayyads at the Battle of Covadonga in 718 and established the Kingdom of Asturias, which historians regard as the beginning of the Reconquista.