[All]: The motif of the laughing sage is attested in a number of folklore sources (see Boberg 1966, 69 (D1318.2.1); Davíð Erlingsson 1980). Davíð Erlingsson (1980) finds both this and the motif of the otherworld spirit that pollutes waterways in Irish sources about the dealings of the hero Fergus mac Léite with the elf-people.