Ogham Trees
The Ogham is a tree alphabet which predates Celtic tribes. They are found on Pictish stones. The Picts originated from Scotland and were assimilated by the Celtic tribes eventually. The Ogham Alphabet highly resembles some instriptions that were located in N. Italy in the last few centuryies B.C
Irish lore tells that Oghma, the God of knowledge, invented the Ogham. Unfortunenately there are no specific details about how Oghma discovered them.
Ogham are still being used today by , modern Celtic Spiritualists and Druids. Where the seasons are celabrated and the Earth is honored.
I will be adding more to this page soon : )