User blog comment:Darkcloud1111/''The Mark of Athena'' Plot Holes/@comment-4521561-20121015194512/@comment-3146930-20121016010134

But in the book, Arachne claims that they have been helping each other for centuries and Ephialtes has centuries worth of trophices in his hair. Meanwhile, Alcyoneus wasn't supposed to rise until some time in 1942, but Hazel pushed it back to some time in the 70s or 80s, as that was when the Fifth Cohort lost the Eagle and all the Imperial Gold. Either way, he hasn't been around for centuries. In reality, the only logical explination is that they never rose as they are still underground and didn't officially rise until Bacchus lifted them into the Roman Coliseum, however that seems like cheating to me, like a cheap way around divine laws.