Origins
Celtic paganism, as practiced by the ancient Celts, is a descendant of Proto-Celtic paganism, itself derived from Proto-Indo-European paganism. … 展开

Celtic religion was polytheistic, believing in many deities, both gods and goddesses, some of which were venerated only in a small area or region, or by a particular tribe, but others whose … 展开

Celtic burial practices, which included burying grave goods of food, weapons, and ornaments with the dead, suggest a belief in life after death.
A common factor in later mythologies from Christianized Celtic nations was the otherworld. … 展开

Druids
According to a number of Greco-Roman writers such as Julius Caesar, Cicero, Tacitus and Pliny the Elder, Gaulish and British society held a group of 展开

Comparatively little is known about Celtic paganism because the evidence for it is fragmentary, due largely to the fact that the Celts who practised it wrote nothing down about their religion. … 展开

Some scholars, such as Prudence Jones and Nigel Pennick, have speculated that the Celts venerated certain trees. Other scholars, such as Miranda Aldhouse-Green, believe that the Celts were animists, believing that all aspects of the natural world 展开

Sacred spaces
Evidence suggests that among the Celts, "offerings to the gods were made throughout the landscape … 展开