A Tree Worshipper is a person who practices Druidism, an ancient religion that was practiced in parts of Europe and the British Isles. The term DRUID comes from the Celtic word for 'KNOWLEDGE' and refers to a member of the priestly class in ancient Celtic societies. Druids were responsible for performing rituals, offering sacrifices, and interpreting natural phenomena. They also served as advisors to kings and other leaders. Tree worship was an important part of Druidism, and Druids believed that trees had spiritual power and could be used to communicate with the gods.