The Columbia Encyclopedia, Sixth Edition. 2001-07.
Dodona
(dd´n) (KEY) , in Greek religion, the oldest oracle, in inland Epirus, near modern Janina, sacred to Zeus and Dione. According to Herodotus, an old oak tree there became an oracle when a black dove, from Egyptian Thebes, settled on it. Priestesses interpreted the rustling of the trees leaves, the cooing of doves, and the clanging of brass vessels that were hung from the trees branches. The site has been extensively excavated in the 20th cent.