This is the English version of this article translated by Patrick Hogan. The original Italian version was written by Lara Pagani and first published on 24/03/2006.
Here is the Italian version of this entry.
We know nothing of this grammarian; he is known to us only through one attestation in the exegetical scholia ad Il. 21, 18. There Pythocles pronounced the sequence ὁ δ’ ἔσθορε in such a way that ὁ δέ constituted one word: he understood this as a substitute for the conjunction καί, and …