Stock Photo - France. Druid lecturing in a forest. A druid was a member of the high-ranking professional class in ancient Celtic cultures. While perhaps best remembered as religious leaders, they were also legal authorities, adjudicators, lorekeepers, medical professionals and political advisors. While the druids are reported to have been literate, they are believed to have been prevented by doctrine from recording their knowledge in written form, thus they left no written accounts of themselves. They are however attested in some detail by their contemporaries from other cultures, such as the Romans and the Greeks, in ""Mon Histoire de France"" by Medemoiselles H-S Brés. Hachette Pub. 1926)