entity_id,period_id,confidence,rationale,source_id,review_status
ENT_NORR_ASGARD,PER_NOR_VIKING,high,"Stronghold of the Æsir, situated at the upper reaches of Yggdrasil and reached from Midgard by Bifröst; contains Valhalla. Gylfaginning attests its building and its halls.",SRC_PROSE_EDDA,reviewed