Apuleius tells us of his own popularity as a writer, and yet both the literary and the material records are silent about his works for almost one hundred and fifty years after his death. Various attempts to identify allusions to his works before Lactantius and other fourth-century authors have proven unconvincing. This article suggests that there is a clear allusion to the Metamorphoses in Tertullian's treatise Aduersus Valentinianos (beginning of the third century). Tertullian uses Apuleius to denigrate the Valentinians and to assimilate the name of one of their gods to the braying of an ass.