Maeterlinck's speculations, despite their medieval Provenience, have a practical orientation.
"Prophets of Dissent Essays on Maeterlinck, Strindberg, Nietzsche and Tolstoy"
Otto Heller
A certain incongruity between the realistic and the romantic aspects in the behavior of the principals is saved from offensiveness by a disposition on the part of the spectator to refer it, unhistorically, to the Provenience of the story.
"Prophets of Dissent Essays on Maeterlinck, Strindberg, Nietzsche and Tolstoy"
Otto Heller
If the Siegfried-Hagen story is purely human, then the dragon cannot have originally belonged to it, but was later introduced, because of the widespread belief in the dragon as the guardian of treasure, and in order to answer the question as to the Provenience of the hoard.
"The Nibelungenlied"
Unknown