The Noda BiHuda (Rabbi Yechezkel Landau) has the question of a woman who offered herself to the leader of some band of ruffians, to save the lives of a large number of Jews. Such a question had appeared in a responsum several centuries earlier.
Personally I think the world is a large and weird enough place that it's likely (or at least plausible) that such an event happened more than once a millenium; but Rabbi Aaron Rothkoff-Rakeffet said he suspected that this was a historical question to which Rabbi Landau wanted to add something. And the fact that Rabbi Landau's account has more detail than the earlier responsum? "He was a good teacher, he embellished with details to get your attention."