Gaul is an ancient region of west Europe as well as a term describing the Celtic tribes that lived in the area of France, Belgium, the South Netherlands, Southwestern Germany, and Northern Italy. The Gauls spread from central Europe from 500 BC until 500 AD and were warrior tribes who lived from hunting and fishing. They used to live in huts with thatched roofs and their religion is called druidism which has nature as its main focus. Two of their main festivals were one, “la fête du gui (mistletoe)” to celebrate the new year and two, a festival which celebrated the return of the light after the long, dark winter months where the Gauls burned Yule logs. Between 58 and 51 BC Julius Caesar conquered the North of the Alps which are also called Transalpine Gaul. The chief warrior, Vercingétorix had to surrender to Caesar and France became part of the Roman territory.
These links provide information about the "Gauls" and lead you to the online Encyclopedia and the Oxford Dictionary: