In the valley that nests under the slopes of Mount Olytsika, Tmaros or Tomaros according to the ancient written sources, 22km south of Ioannina in the Municipality of Dodoni, are located the ruins of the religious centre and Oracle of Zeus and Dione, a site which also functioned as the administrative seat of the various in time coalitions of ancient Epirotes.
Settlement - Citadel of Grand Gardikiou is the northernmost of the three that kept Ioannina basin duting antiquity.
Identified with the ancient Passarona, religious center of the state of Molossos, and the foundation associated with King Pyrrhus, placed in the first half of the 3rd century. (BC.). Newest fortifications within the citadel held the period of the Balkan wars.