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Matthias Flacius included "Dietrich von Zengg" as one of his witnesses to truth in his 1556 Catalogus testium veritatis (VD16 F 1293, p. 937):
Theodericus primum minorita, postea episcopus Croatiae, vixit anno 1410. In fine suae prophetiae, una cum aliis Rhythmicis prophetiis impressae, praedixit fore, ut Romana sedes, quae simonia et libidinibus esset contanimatissima, corruat...It's clear that Flacius was reading the same prophecy that we know, where one finds at the end (VD16 T 736, a4r):
Auch so hat wol geredt die Kriechisch zung vonn der blindtheyt der Simoney / vnd vonn der vnkeüsch der Römischen priester / darvon der Römisch stůl wirdt fallen...
No. He was referring to Melchior Amberbach's 1548 Vom Ende der Welt (VD16 A 2161).
Guldenmund's edition of Carion and Zengg is also not entirely lacking in verse. Carion's "Hidden Prophecy" is prose, but the "Interpretation of the Hidden Prophecy" inserts sixteen lines of verse before the "Hidden Prophecy" ("Es ist am tag / man hats erfaren // Das groß trübsal vor tausent jaren"), and includes two short extracts of Latin verse in the interpretive section.
"Dietrich von Zengg" is also excerpted by Wolfgang Lazius in his Fragmentum vaticinii of 1547 (VD16 ZV 9507), which contains many prophecies in verse, but the excerpt doesn't include the section summarized by Flacius, and doesn't identify the author by name or by nation.
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I have a number of presentations coming up soon, so posting may be light in February.