I'm doing some research, and a couple of articles make reference to a story by Hesse (or possibly a story in an anthology edited by Hesse). The story concerns Jure Grando, a vampire from (what is now) Croatia. The story was based on a "real" folklore vampire, and was first recorded by Baron Valvasor in his 15-tome work, The Glory of the Duchy of Carniola. From here, it was included in The Rhone's Antiquarian (?) - any information about this would be welcome, as I can't find anything about it in English.
This was where Hesse picked up the story, and either re-wrote it or included it in an anthology. This looks like the best candidate:
Spuk--Hexengeschichten-Rheinischen-Antiquarius-Hermann-Hesse
Is it in here? Any other information? Any English translations?
Thanks.