@T.E.D. Seems like it would have been possible at any rate - signatures go as far back as writing itself - but they were mostly used on documents such as land deals or legal decrees. A "signed book" is not really a "signature" but actually an autograph and the concept of collecting autographs didn't really exist until the 16th century

(of course, autographs as in "books scribed by their author" were in great demand in antiquity but I don't think they would be "signed" beyond the author putting their name on it as normal for any book)

My presumption looking into this last week is that "Homer", if there indeed was a single such person, likely was not literate, and what we have are records of the oral epic poem transcribed by scribes.

As the quote goes, the Iliad was not actually written by Homer but by another man of the same name

Kings and priests would have had seals to authenticate a document but a poet probably did not...

Since it was oral, and clearly designed with memory helpers, I find it much more helpful to consider Homer to have been a Bard rather than a poet.

Damn earwurm...