Successor period to the Nordic Bronze Age across Scandinavia, spanning the Pre-Roman, Roman, and Germanic Iron Ages, marked archaeologically by chiefly halls, bog deposits of weapons and treasure (e.g. Nydam, Illerup Adal), and the gradual emergence of named tribal groups (Geats, Svear, Danir) mentioned by writers like Jordanes and Procopius.
Gradually crystallizes into the historically-named early medieval kingdoms and petty kingdoms of Scandinavia (e.g. the Kingdom of Sweden/Svealand, the Kingdom of Denmark, and Norway's petty kingdoms, already or separately tracked in the dataset) across the 8th-10th centuries CE as the Viking Age begins.