Roman Mentionings

In The Lightning Thief
Chiron talks about how the gods moved to diiferent place sush as Rome. He said they had differnet names too, Jupiter for Zeus,Venus for Aphrodite and so on.

Quote he said

"plenty of people weren't very fond of Rome..."

The Battle of the Labyrinth
Percy and his friends come in a room where there are Roman mosaics and Annabeth says "its the only work of architecture that grows bt itself."