The first message in Ogham was 7 letter “B”‘s carved into Birchwood:
a warning to Lug mac Elathan from Ogmios that his wife would be
abducted to the underworld seven times unless protected by carrying
a charm of birchwood.
Be aware that your wife, Lug, Elathan’s son
Be carried to the other world shall be
Be aware for the rest of her life neath the sun
Be taken again six times more unless she
Be guarded though by the birch bark be done
Be charm carried with her all times I decree
Be warned by the seven B’s on this birch – let the spell be done!