Celtic sacred trees
Many types of trees found in the Celtic nations are considered to be sacred, whether as symbols, or due to medicinal properties, or because they are seen as the abode of particular nature spirits. Historically and in folklore, the respect given to trees varies in different parts of the Celtic world. On the Isle of Man, the phrase 'fairy tree' often refers to the elder tree. The medieval Welsh poem Cad Goddeu (The Battle of the Trees) is believed to contain Celtic tree lore, possibly relating to the crann ogham, the branch of the ogham alphabet where tree names are used as mnemonic devices. List of trees Oak The oak tree features prominently in many Celtic cultures. The ancient geographer Strabo (1st century AD) reported that the important sacred grove and meeting-place of the Galatian Celts of Asia Minor, Drunemeton, was filled with oaks. In an often-cited passage from Historia Naturalis (1st century AD), Pliny the Elder describes a festival on the sixth day of the moon where the druids climbed an oak tree, cut a bough of mistletoe, and sacrificed two white bulls as part of a fertility rite. Britons under Roman occupation worshipped a goddess of the oak