In a well-known passage of his Historiae (7,144,632-641), John Tzetzes makes a long list of authors of paradoxographical works, including the name of a certain Ptolemy. Until today, scholars could not suggest a persuasive identification of this writer, mostly because the scholia that the same Tzetzes composed for his own work have been ignored for a long time. One of these scholia, though, makes clear that the Ptolemy mentioned in the text is in fact. In this paper, I will argue that this author could be identified with the king Ptolemy XII, in accord with the well-known relationship between the Ptolemaic court and the literary genre of paradoxography.