Short answers, pulled from the story.
The name Goths appears in Roman writings during the first century AD, specifically mentioned by Pliny the Elder in 77 AD. This early group known as Gutones lived near the mouth of the Vistula River and were linked to the Wielbark culture emerging around the middle of the first century.
Gothic fleets attacked cities across Asia Minor including Lemnos and Scyros before breaking through Thermopylae to sack Athens, Corinth, Argos, Olympia, and Sparta. An Athenian militia led by historian Dexippus pushed them north where they met Roman cavalry under Gallienus near the Nessos river with reported barbarian casualties reaching three thousand men.
The conflict culminated after Gothic refugees crossed the Danube at Durostorum in 376 following broken promises of land south of the river. Corrupt officials mistreated these refugees so severely that leader Fritigern unleashed a rebellion joining slaves and deserters which resulted in Roman Emperor Valens being killed during this devastating defeat.
Internal troubles weakened the kingdom leading to its progressive conquest by the Umayyad Caliphate starting 711 after the defeat of last king Roderic at Guadalete. Some nobles fled mountain areas supporting Pelagius uprising founding Kingdom of Asturias 718 defeating Muslims Covadonga c. 722 beginning Reconquista modern Spain Portugal evolved from Asturian kingdom.
The Eastern Roman Empire invaded Italy shortly after Theodoric death initiating the Gothic War which severely devastated the peninsula making brief resurgence under Totila killed Taginae 553. Last stand Teia Mons Lactarius 553 ended resistance remaining Goths assimilated Lombards another Germanic tribe invading founded Kingdom Lombards 567.