entity_id,source_id,evidence_type,source_note
ENT_WEL_MATH,SRC_MABINOGION,direct attestation,Fourth Branch (Math fab Mathonwy): Math's taboo drives the plot; he transforms his nephews as punishment; co-creates Blodeuwedd with Gwydion; creates Lleu's arms and name by tricking Aranrhod; the lord of Gwynedd who embodies sovereign magic in the Fourth Branch; primary attestation