In the collection of Ausonius' Epigrams edited by R. P. H. Green (1999), three are dedicated to Diogenes the Cynic. One of them, epigram 54, constitutes an epitaph for the philosopher's tomb, and is composed as a paraphrase of epigram 7, 64 of the Anthologia Palatina. Moreover, a rare tradition on Diogenes' catasterism appears in this poem, attesting that the philosopher was placed in the sky by the aster of Leo to serve as the guard dog of the heroine Erigone. This research thus begins with an analysis of the transition from the Greek to the Latin epigram of Ausonius, and then develops the investigation of the issue of Diogenes' catasterism, by examining the broader context of the Greco-Roman sources on related topics.