Oracle
An oracle is, originally, a place or person through which a divine response is consulted. The famous oracles of Greek antiquity: Delphi (Apollo, Pythia), Dodona (Zeus, sacred oaks), Siwa (Ammon, Egyptian-Greek). In modern use, "oracle" also refers to a divinatory tool (oracle of love, angel oracle, color oracle).
The Oracle of Delphi
The most famous oracle of antiquity, active from c. 8th century BC to 4th century AD. Decisions of empires, wars and royal successions consulted there. Closed by emperor Theodosius in 391 AD with the prohibition of pagan worship.