Chiron's Clique: Seers
These kids spend all their time at lunch with tarot cards, crystals balls, fortune cookies, and, most importantly, astrology books. If you want to get a hint about what's on the horizon for your life, these are the people to ask. But you better think twice before you start looking for answers: the truth is, you might not like what you hear.
Tiresias
This blind prophet of Thebes could see into the future like nobody's business. His main method of divination was through augury—back then, that meant the art of predicting the future through the flight patterns and songs of birds. He also could divine the future from the smoke of burnt offerings, and he even received visions straight from the gods. This prophet of prophets shows up in tons of ancient Greek tragedies and is most famous for his role in the Oedipus plays.
Oracle of Delphi/Apollo
The Oracle of Delphi was the place to go in ancient Greece if you wanted to get a little peek into your future. Usually, one young girl acted as the prophetess. Her duties included hanging out in a temple all day, inhaling volcanic fumes that drifted up through the earth, and having crazy trippy trances in which people believed she could catch glimpses of the future. The Oracle was a temple of Apollo, the god of prophecy, who was said to be the guy sending the visions. It's said that Apollo claimed the Oracle—which used to be belong to Gaia, the Earth—after killing Python, Gaia's son, who also happened to be a giant snake. (It's sentences like this that remind us of how cool Greek mythology is.)
Mamitu
Mamitu was a Mesopotamian goddess who lived in the Underworld and knew the fate of everybody. Of course, she was also the one who decided everyone's fate, so maybe her prophesying ability isn't quite as impressive as it sounds.