Dushara — Dhu-Shara, 'He of the Shara' (Shara being the name of the mountain ridge above Petra) — was the chief god of the Nabataeans, the divine patron of the royal house, and the lord of the great rock-cut sanctuary at Petra. He was a mountain-god in his original character, the divine occupant of the high red sandstone cliffs that surrounded the Nabataean capital, and his cult-image was traditionally aniconic — a black stone, square or pillar-shaped, set up at the high places. The Nabataean tradition was deeply suspicious of figural representation of deity, and Dushara's cult-stones (called baetyls, from a Semitic word meaning 'house of god') were the principal objects of his worship throughout the kingdom.
His great sanctuary at Petra — the city carved from the living rock, with its famous facade of the Khasneh ('Treasury') and the great stepped platform of the Qasr al-Bint (where the cult-image of Dushara probably stood) — flourished from the late third century before our era through the second century of our era. The royal tombs cut into the cliffs at Petra were under his protection; the king's coronation, his great state ceremonies, and his death and burial all involved Dushara's priesthood and his rites. The Nabataean kings styled themselves 'beloved of Dushara' on their inscriptions, and the god was the divine warrant of their authority.
In the Hellenistic and Roman periods, Dushara was identified with Dionysus by Greek writers (because the mountain-and-vine associations of the Greek god seemed to fit) and with Zeus and with the sun-god (because the mountain-throne and the supreme-god functions were felt) — but the identifications were imperfect. Dushara had no clear narrative myth in the Greek style; he was the lord of the mountain, the guarantor of the royal house, and the receiver of sacrifices and dedications. His cult was substantially aniconic, ritual rather than narrative, and bound closely to the Nabataean political and territorial identity.
After the Roman annexation of the Nabataean kingdom in 106 of our era, Dushara's cult continued under imperial protection for several centuries — Petra remained an important religious center into the third century — but the gradual Christianization of Arabia and the eventual Arab Islamic conquest of the seventh century extinguished the cult. The aniconic cult-stones of Dushara, however, fed into a deep current of Arabian religious sensibility that Islam would inherit; the Black Stone of the Ka'ba at Mecca, which Muslims kiss during the hajj, is in some sense a continuation of the baetyl-tradition of pre-Islamic Arabia, with Dushara's stones in the Petra-Mecca line being among the most prominent ancestors.

