There are various fragments of Greek and Latin poetry whose provenance is unknown, such as quotations in other works whose source hasn't survived.
Are there any known fragments longer than a couple lines, whose author is unknown or uncertain?
There are various fragments of Greek and Latin poetry whose provenance is unknown, such as quotations in other works whose source hasn't survived.
Are there any known fragments longer than a couple lines, whose author is unknown or uncertain?
Authorship and the rights associated with it, as we know it now, is a relatively modern concept. In antiquity, works had a higher probability of being preserved (by being distributed more, by being sold more, by being in higher demand) if they were ascribed to a famous author, preferably a dead one who couldn't disclaim authorship anymore. Thus "book sellers" had an incentive to lie about authorship of their wares, with probably a very small chance of being caught and suffering repercussions.
You can find contested works easily on Google by looking for "pseudo-[famous author]" . A few examples:
Nux, spuriously ascribed to Ovidius https://en.wikipedia.org/wiki/Nux_%28poem%29
appendix vergiliana, supposedly a collection of youth works by Vergilius. https://en.m.wikipedia.org/wiki/Appendix_Vergiliana