Laudator Temporis Acti

Greek Anthology 11.204 (by Palladas; tr. W.R. Paton):

I was thunderstruck when I saw the rhetor Maurus, with a snout like an elephant, emitting a voice that murders one from lips weighing a pound each.

Ῥήτορα Μαῦρον ἰδὼν ἐτεθήπεα, ῥυγχελέφαντα,
    χείλεσι λιτραίοις φθόγγον ἱέντα φόνον.

Greek Anthology 16.20 (by Ammianus; tr. W.R. Paton):

I marvelled when I saw the rhetor Maurus, the heavy-lipped and white-robed demon of the art of Rhetoric.

Ῥήτορα Μαῦρον ἰδὼν ἀπεθαύμασα, τὸν βαρύχειλον,
    τέχνης ῥητορικῆς δαίμονα λευκοφόρον.

A.H.M. Jones et al., Prosopography of the Later Roman Empire, Vol. I: A.D. 260-395 (Cambridge: Cambridge University Press, 1971), p. 570:

Maurus (?) 3                                                                    rhetor L IV
Rhetor lampooned by Palladas; Egyptian, according to a lemma of dubious value, but to judge from the poems, a negro; cf. ῥυγχελέφαντα, χείλεσι λιτραίοις, in Anth. Gr. XI 204. 1-2, and βαρύχειλον, ib. XVI 20. 1 (ascribed to Palladas by H. Beckby ad loc.). Editors take Μαῦρος in both poems as a proper name, but it is probably an ethnic (a Moor).

"H. Beckby ad loc." is Hermann Beckby, ed. and tr., Anthologia Graeca, Buch XII-XVI, 2nd rev. ed. (Munich: Ernst Heimeran Verlag, [1965]), p. 314.

According to Liddell-Scott-Jones, ῥυγχελέφας, meaning "with an elephant's trunk," is a hapax legomenon.

Dudley Fitts, More Poems from the Palatine Anthology in English Paraphrase (New York: New Directions, 1941), page number unknown, poem number 41:

Lo, I beheld Maurus,
Professor of Public Speaking,
Raise high his elephant-snout
And from between his lips
(12 oz. apiece) give vent
To a voice whose very sound is accomplished murder.

I was impressed.

Palladas, Poems, a selection translated and introduced by Tony Harrison (London: Anvil Press Poetry, 1975), unpaginated, poem number 42, with the heading Maurus:

The politician's elephantine conk's
amazing, amazing too the voice that honks
through blubber lips (1 lb. net each)
spouting his loud, ear-shattering speech.