particularly trying times, such as the invasion of Caesar, could the Gauls unite under a single leader like Vercingetorix. Even then, however, the faction lines were clear. The Romans divided Gaul broadly into Provincia (the conquered area around the Mediterranean), and the northern Gallia Comata ("free Gaul" or "long-haired Gaul"). Caesar divided the people of Gallia Comata into three broad groups: the Aquitani; Galli (who in their own language were called Celtae); and Belgae. In the modern sense, Gaulish peoples are defined linguistically, as speakers of dialects of the Gaulish language. While the Aquitani were probably Vascons, the Belgae would thus probably be a mixture of Celtic and Germanic elements. Julius Caesar, in his book, The Gallic Wars wrote, Religion The Gauls practiced a form of animism, ascribing human characteristics to lakes, streams, mountains, and other natural features and granting them a quasi-divine status. Also, worship of animals was not uncommon; the animal most sacred to the Gauls was the boar which can be found on many Gallic military standards, much like the Roman eagle. Their system of gods and goddesses was loose, there being certain deities which virtually every Gallic person worshipped, as well as clan and household gods. Many of the major gods were related to Greek gods; the primary god worshipped at the time of the arrival of Caesar was Teutates, the Gallic equivalent of Mercury. The "ancestor god" of the Gauls was identified by Julius Caesar in his Commentarii de Bello Gallico with the Roman god Dis Pater. Perhaps the most intriguing facet of Gallic religion is the practice of the Druids. The druids presided over human or animal sacrifices that were made in wooded groves or crude temples. They also appear to have held the responsibility for preserving the annual agricultural calendar and instigating seasonal festivals which corresponded to key points of the lunar-solar calendar. The religious practices of druids were syncretic and borrowed from earlier pagan traditions, with probably indo-European roots. Julius Caesar mentions in his Gallic Wars that those Celts who wanted to make a close study of druidism went to Britain to do so. In a little over a century later, Gnaeus Julius Agricola mentions Roman armies attacking a large druid sanctuary in Anglesey in Wales. There is no certainty concerning the origin of the druids, but it is clear that they vehemently guarded the secrets of their order and held sway