Sometimes I remember that Nico being italian is relevant in HoO.
There are a couple of scenes in HoH and BoO where Nico explains to the others something regarding the roman influence in their current lives and informations that he,as a greek demigod,shouldn't be able to know since it's about the romans. Like,for example,when they were talking about Diocletian's scepter and Jason and Hazel were giving their opinions on him,Nico also participated in the discussion. I love these little details because it makes us understand that Nico si very smart and knowledged,but I just realized that it's also because he is italian.
Italy has a very long and rich history behind,the ancient roman empire is just one of the biggest parts of it. During elementary and middle school we study a lot of it in history classes,so Nico probably had to go through lessons about it when he was still going to school (I'm pretty sure he continues to research and acculturate himself on his own now). So it's totally normal for him to know. And technically,he should also have a lot of informations on the emperors in ToA too,if we follow the same reasoning. If only Apollo brought Nico with him on his quests,maybe it would have been easier to figure them out.
I'm continuing the "Nico is a walking Wikipedia for demigods" agenda because I refuse to let him become clueless like Riordan is trying to do. (Nico not knowing many god/goddess? Let's be for real,that boy is studying to have so many informations,it's impossible that he doesn't know a deity when he was able to find a God of a dead pantheon on his own.)











