entity_id,period_id,confidence,rationale,source_id,review_status
ENT_WEL_ANNWN,PER_CEL_MEDIEVAL_WELSH,high,"The Welsh Otherworld; named and described in the First Branch of the Mabinogi; further developed in the ""Preiddeu Annwfn"" (Spoils of Annwn), a poem attributed to Taliesin c. 9th-10th c.",SRC_MABINOGION,reviewed