This is the English version of this article translated by Patrick Hogan. The original Italian version was written by Paola Ascheri and first published on 18/10/2011.
Here is the Italian version of this entry.
Demetrius, a grammarian of unknown origin, has been dated to ca. mid-1st c. BCE (V. di Benedetto, Demetrio Cloro e Aristone di Alessandria, «ASNP» 35 (1966), pp. 321-324, esp. pp. 322-323; F. Montanari, Demetrios (n. 36), N.P. 3…