Dionysus was the Greek god of wine and a major figure in mythology. He represented the intoxicating power of wine, along with its social and beneficial influences. Followers of Bacchus would drive themselves into a frenzy of intoxication, and in the spring Roman women would attended secret ceremonies in his name, as Bacchus was also associated with fertility.
The geographical origins were vague, but almost all myths depict him as being foreign. In Greek mythology Dionysus was the son of Zeus and Semele; as Dionysus grew up he discovered the culture of the vine and the method of extracting its most precious juice. The way of the Romans was to adopt various elements from other cultures and civilisations - and this included the giving of Greek God names the equivalent Roman names.

 

The Roman priests then started to adopt the mythology about the Gods and Goddesses like Bacchus. Thus Greek and Roman religion and mythology therefore become more closely entwined and recorded as so.
For the Romans, Dionysus became Bacchus, the son of Jupiter and Semele. A reflection on Greco and Roman philosophies regarding democratic government, Bacchus was a promoter of civilization, a lawgiver and peacemaker. Wine, it seems, began to come into its own.
The Roman Empire, though infinitely imperfect, was not one to deprive its citizens of their favourite God. From 300 B.C. to the beginning of the Christian period, the population in Rome exploded from 100,000 to over one million inhabitants. The result was an equally size-able increase in the demand for affordable wine, Romans in Rome were thought to be drinking 1.8 million hectolitres of wine per year. That was enough for every man, woman and child to have half a litre of wine per day, every day of the year.
From the great vineyards of Italy to Bordeaux, Rhône and Burgundy, Bacchus single-handedly planted the first vines in what would become the world's most legendary wine regions. The Roman god of wine and intoxication, his festival was celebrated on 16 - 17 March.
The bull, the serpent, the ivy and wine are the signs of Bacchus, and strongly associated with satyrs, centaurs and sileni. He is often shown riding a leopard, wearing a leopard skin, or in a chariot drawn by panthers, and may also be recognized by a chalice and grapes.