in ferns, mosses and lichens. Etymology The name comes from Pliny the Elder who reveals that 30 years after the Roman invasion of Britain their knowledge of it did not extend beyond the neighbourhood of silva caledonia. He gives no information about where the silva caledonia was, but the known extent of the Roman occupation suggest that it was north of the River Clyde and west of the River Tay. Legend and folklore In the Matter of Britain, the forest is the site of one of King Arthur's Twelve Battles, according to the Historia Brittonum, in which the battle is called Cat Coit Celidon. Scholars Rachel Bromwich and Marged Haycock suggest that the army of trees animated by sorcerers in the Old Welsh poem Cad Goddeu ("Battle of the Trees") are intended to be the Caledonian Forest. In related Merlin literature, the figure of Myrddin Wyllt retreated to these woods in his madness after the Battle of Arfderydd in the year 573. He fled from the alleged wrath of the king of Strathclyde, Rhydderch Hael, after the slaying of Gwenddoleu ap Ceidio. This is written in the two Merlinic poems in Middle Welsh Yr Oinau and Yr Afallenau in the Black Book of Carmarthen. The forest is also the retreat of another character named Lailoken from the Vita Kentigerni, who also fled into the woods in a fit of madness and who may be the original model for Myrddin Wyllt. In the Middle Welsh story Culhwch and Olwen, the main character Culhwch is the son of a king named Celyddon Wledig, who may or may not be related to the forest in name. Another figure from the same story, Cyledyr Wyllt hints at a close relationship of the forest being a retreat for people who suffered from a special kind of madness or gwyllt (Irish geilt). In line 994 to 996 of the story, it is briefly explained, "a Chyledyr Wyllt y uab, a llad Nwython a oruc a diot y gallon, a chymhell yssu callon y dat, ac am hynny yd aeth Kyledyr yg gwyllt." ("and his son Kyledyr the Wild. Gwynn killed Nwython and cut out his heart, and forced Kyledyr to eat his father's heart, and that is how Kyledyr went mad"). Though not named directly, the very name Kyledyr Wyllt is close to the two related notions of the forest of Celyddon being where people suffering