This paper discusses the fragment edited by D. Obbink in Oxyrhynchus Papyri LXX, trying to illustrate the possible literary sources of the text. The "Ass-Romance" (well known through Apuleius' Metamorphoseis and Ps.-Lucian's Onos) is the most obvious scenario, but our text can be better understood if we have in mind also other narratives, like the so called "Aesopus Novel"
