Question: Which cathedral that features the Gero cross is a renowned monument of German Catholicism  and Gothic Architecture?
Sentence (from "Flamboyant"): The term was first used by Eustache-Hyacinthe Langlois (1777–1837), and like all the terms mentioned in this paragraph except "Sondergotik" describes the style of window tracery, which is much the easiest way of distinguishing within the overall Gothic period, but ignores other aspects of style.
Relevant evidence: No