Mafia 99. The tragedy of the city of Ve-He.

The first link in Google leads to Hellenistic Egypt. And I highly doubt that Nebok would introduce such a difficult-to-pronounce (and even more difficult to remember) historical event just to lead us through a chain of clues to Ptolemy. And since no associations with this arise, it probably means that we should rather focus on the article itself, but who knows, I've only correctly deciphered two or three clues in all the games.

Added 1 minute ago
Oh, or it could be the period and dates of Ptolemy's life. That's even better.