Old traditions say that the headlands of Castle Treen, or rather Trereen, on which the Logan Rock carn and adjacent crags stand, was raised out of the sea by enchantment. This portion of the stronghold, enclosed by the inner line of defence, running directly across the isthmus, is generally spoken of as The Castle, and that between it and the outer or landward embankments is usually called Treen Dynas.
It is not known what powerful magician raised this giant's hold, though it was believed that its security depended on a magic stone called "the key of the Castle," respecting which Merlin had something to say, as well as about many other remarkable stones in the neighbourhood. Castle Treen, however, must have stood where it is long before Arthur and his magician visited West Cornwall.
The key was an egg-shaped stone, between two and three feet long, which was contained in the cavity of a rock with a hole facing the sea, through which it might be turned round; and the opening appeared large enough for it to be passed through. Many attempted to get it out, but they always found it to hitch somewhere; and lucky (according to old folks' faith) that it did, because the sage Merlin prophecied that when the key of the Castle was taken out of the hole, Men Amber (the holy rock) would be overthrown, the Castle sink beneath the ocean, and other calamities occur.
The key was situated near the bottom of a deep chasm called The Gap, which is passed on approaching the Logan Rock by the usual path. It required a sure-footed climber, of strong nerve, to reach it, and this could only be done from land, at low water, or nearly so.
Surging waves occasionally changed the position of this magic stone, and from the direction of its smaller end, as it lay in a trough of water, prognostics were drawn with regard to the seasons, &c.
Few persons had sufficient hardihood to descend the precipitous cliff and risk being caught in The Gap by a flowing tide; and the key of the Castle remained a mysterious and venerated object till Goldsmith's mischievous tars, or the dockyard men who were employed in erecting machinery to replace Men Amber (as the stone they overthrew was formerly called) heard of it and the traditions connected therewith. Then, one day, some of these wretches, on farther mischief bent, entered The Gap in a boat, and, being provided with crow bars, they broke away the edges of the rock that enclosed the key, ripped it out, and tumbled it down among the sea-washed pebbles! Some calamity has surely befallen these wretches ere this, or Bad Luck is a mere name, and powerless as an avenging deity.
Part of Merlin's prophecy was fulfilled, however, yet not in the order predicted.
The venerated nodule was what is called, among miners, a "bull's eye," or "pig's egg," of large size. It appeared to be a closer-grained and harder stone than what surrounded it.
Immediately afterwards is a long (long) story about the giants of Castle Treen. And something about the fairies there too. And finally, about the witches that used it as a flying-off point. Pretty crowded spot.
On an almost inaccessible granite peak seaward of the pile of rocks known as Castle Treryn (pronounced Treen), once the haunt and meeting-place of witches, on the summit of which is perched the far-famed Cornish logan-rock, is a sharp peak with a hole in it, large enough to insert a hand. At the bottom lay an egg-shaped stone, traditionally called the key of the castle, which, although easily shifted, had for ages defied all attempts at removal. It was said that should any one ever succeed in getting it out, Castle Treryn - in fact the whole cairn - would immediately disappear. It was unfortunately knocked out by the men who replaced the logan-rock, thrown down by Lieutenant Goldsmith. Its position was often altered by heavy seas, and from it the old folk formerly foretold the weather.
From p104 in
Cornish Folk-Lore. Part II [Continued]
M. A. Courtney
The Folk-Lore Journal, Vol. 5, No. 2. (1887), pp. 85-112.
Elsewhere in his 'Popular Romances...' Hunt mentions the regrettable incident alluded to by Mr H in his post. You can imagine the laddish larking about which led up to the stone being pushed off. Dr Borlase really should have kept his mouth shut - or (conspiracy theory) was he trying to get more patients? as it seems the rock's curative powers were lost:
Up to the time when Lieutenant Goldsmith, on the 8th of April 1824, slid the rock off from its support, to prove the falsehood of Dr Borlase's statement, that "it is morally impossible that any lever, or, indeed, force, however applied in a mechanical way, can remove it from its present position," the Logan Rock was believed to cure children, who were rocked upon it at certain seasons, of several diseases; but the charm is broken, although the rock is restored.
When this great natural curiosity was, as it was thought, destroyed, the public wrath was excited, and appeased only' by the conciliatory spirit manifested by Mr Davies Gilbert, who persuaded the Lords of the Admiralty to lend Lieutenant Goldsmith the required apparatus for replacing it. Mr D. Gilbert found the money; and after making the necessary arrangements, on the ad of November 1824, Goldsmith "had the glory of replacing this immense rock in its natural position." The glory of Goldsmith and of Shrubsall, who overturned another large Logan Rock, is certainly one not to be desired.
If the adventurous traveller who visits the Land's End district will go down as far as he can on the south-west side of the Logan Rock Cairn, and look over, he will see, in little sheltered places between the cairns, close down to the water's edge, beautifully green spots, with here and there some ferns and cliff-pinks. These are the gardens of the Small People, or, as they are called by the natives, Small Folk. [...] To prove that those lovely little creatures are no dream, I may quote the words of a native of St Levan:
"As I was saying, when I have been to sea close under the cliffs, of a fine summer's night, I have heard the sweetest of music, and seen hundreds of little lights moving about amongst what looked like flowers. Ay! and they are flowers too, for you may smell the sweet scent far out at sea. Indeed, I have heard many of the old men say, that they have smelt the sweet perfume, and heard the music from the fairy gardens of the Castle, when more than a mile from the shore."
Strangely enough, you can find no flowers but the sea-pinks in these lovely green places by day, yet they have been described by those who have seen them in the midsummer moonlight as being covered with flowers of every colour, all of them far more brilliant than any blossoms seen in any mortal garden.
MA Courtney published a book called "Cornish Feasts and Folklore" in 1890. In it he says of the key of the castle being in a sharp peak on the summit. He then adds that it was knocked down by the men who replaced the logan stone after it was pushed off the rock by Lieutenant Goldsmith in 1824.
Treryn fort is mentioned in 'Popular Romances of the West of England' by the Victorian Robert Hunt.
The giant's castle at Treryn, remarkable as a grand example of truly British Cyclopean architecture, was built by the power of enchantment. The giant to whom all the rest of his race were indebted for this stronghold was in every way a remarkable mortal. He was stronger than any other giant, and he was a mighty necromancer. He sat on the promontory of Treryn, and by the power of his will he compelled the castle to rise out of the sea. It is only kept in its present position by virtue of a magic key. This key the giant placed in a holed rock, known as the Giant's lock, and whenever this key, a large round stone, can be taken out of the lock, the promontory of Treryn and its castle will disappear beneath the waters. There are not many people who obtain even a sight of this wonderful key. You must pass at low tide along a granite ledge, scarcely wide enough for a goat to stand on. If you happen to make a false step, you must be dashed to pieces on the rocks below. Well, having got over safely, you come to a pointed rock with a hole in it; this is the castle lock. Put your hand deep in the hole, and you will find at the bottom a large egg-shapped stone, which can be easily moved in any direction. You will feel certain that you can take it out,--but try! Try as you may, you will find that it will not pass through the hole; yet no one can doubt that it once went in.
He also recorded the following:
Treryn Castle, an ancient British fortress, the Cyclopean walls of which, and its outer earthwork, can still be traced, was the dwelling of a famous giant and his wife. I have heard it said that he gave his name to this place, but that is, of course, doubtful. This giant was chief of a numerous band, and by his daring he held possession, against the giants of the Mount, of all the lands west of Penzance. Amongst the hosts who owned allegiance to him, was a remarkable fine young fellow, who had his abode in a cave, in the pile of rocks upon which the Logan Rock stands. This young giant grew too fond of the giantess, and it would appear that the lady was not unfavourably inclined towards him. Of their love passes, however, we know nothing. Tradition has only told us that the giantess was one day reclining on the rock still known as the Giant Lady's Chair, while the good old giant was dosing in the Giant's Chair which stands near it, when the young and wicked lover stole behind his chief and stabbed him in the belly with a knife. The giant fell over the rocks to the level ridge below, and there he lay, rapidly pouring out his life-blood. From this spot the young murderer kicked him into the sea, ere yet his life was quite extinct, and he perished in the waters.
The guilty pair took possession of Treryn Castle, and, we are told, lived happily for many years.
In the Parish of St. Levin, in this County, there is a Promontory, called Castle-Treryn. This Cape consists of three distinct Groupes of Rocks. On the Top of the middle Groupe of Rocks, (which we climbed with some Difficulty and Hazard) we there observed the most wonderful Logan-stone, perhaps, in the World; one of our ingenious Companions took the Dimensions of it, and computed the solid Content, which amounted to about 95 Tons; the two inclined Sides somewhat resemble the two Roofs of a House, meeting in a sort of obtuse Ridge upon the Top. The lower Part of the Stone is a large plain Base, near the Middle of which, projects a small Part on which it rests, which Part seemed to be of a round Form, and not to exceed more than 18 or 20 Inches in Diameter. The lower Part of this too, was somewhat convex'd, by which Means, as it was equally poised on this Part, it became easily moveable upon the large Stone below, the Position of which was most of all wonderful, as the Surface on which the Logan-stone rested was considerably inclined; so that at first Sight, it seemed as it were easy to heave the Logan-stone off, but on Tryal, we found, that we could produce no other Motion than that of Libration, the Power of one Man being only sufficient to move it up and down about half an Inch. It is so high from the Ground, that no one who sees it, can conceive it could be lifted up to the Place where it now rests. It makes a natural Part of the Crag on which it at present stands, and always seems to have belonged.
The public attention has, for the last six months, been much attracted to the celebrated Logan Stone, in Cornwall; not so much on account of its presenting a great natural curiosity, but from the circumstance that in April last, an officer of the British Navy on the Preventive Service, Lieutenant Goldsmith, with his men, threw it down from its time-honoured seat, and the same gentlemen having, within the last few days, replaced it in its former situation - a task of no ordinary difficulty.
[...] The following extract of a letter contains an account of the restoration of this celebrated relic of antiquity:--
"Penzance, Nov. 6.
"The Logan rock is replaced, and rocks as before: it was put up on Tuesday last, after three days' labour, by the help of three pair of large sheers, six capstans, worked by eight men each, and a variety of pulleys. Large chain cables were fastened round the rock, and attached to the blocks by which it was lifted. Altogether there were about sixty men employed. The weight of the rock has been variously computed by different persons, at from 70 to 90 tons. On the first day, when the rock was first swung in the air, in the presence of about two thousand persons, much anxiety was felt by those who were present, as to the success of the undertaking; the ropes were much stretched; the pulleys, the sheers, and the capstans, all screeched and groaned; and the noise of the machinery was audible at some distance. Many were very apprehensive lest so vast a weight might snap all the ropes, and tumble over the precipice, bearing the sheers and scaffolding away with it; however, the whole has gone off with great success.
The materials (which were all furnished gratis, from the dockyard at Plymouth) were excellent, and ingeniously managed; and though a rope or two broke, adn a link of one of the chains tore away a small piece of an angle of the rock, which was thrown with much velocity into the sea, yet the rock was safely supported by its complicated tackling and stands, once more, in precisely its former position!
Lieutenant Goldsmith, who threw it down, was the engineer in replacing it; and, in the opinion of many of the gentlemen of this town and neighbourhood, he has, by his skill and personal labour and attention, not only wiped away the disgrace to which he was exposed by throwing it down, but also acquired so much merit, that they are about to invite him to a public dinner at Pearce's Hotel. This seems to be going a little too far; since whatever credit he may have derived from replacing the rock, seems to be fully counterbalanced by the discredit of its wanton demolition. It is understood that the expenses of this work are defrayed by subscription. Fifty pounds have been given by the London Geological Society."
From 'The Mirror of literature, amusement, and instruction' for November 13th, 1824.
A description from the pre-toppled days of the Logan Stone. I think it's probably really folklore as the story of the 'peasants' seems a bit of a local tale to support the untoppleyness of the stone.
.. I may venture to say, from all I have seen myself of that kind, or read, or heard of, I know not a more singular one than that which I am describing.
It was on a holiday, not long ago, that a vast number of miners and peasants assembled together for the purpose of hurling this prodigious rock into the sea. Every effort was exerted, and all their force applied to no purpose. The vast orb moved as if to mock their toil, but still retained its equilibrium. The people beheld it with astonishment; they concluded it was retained by supernatural agency, and returned venerating the stone.
Those who are hereafter to visit this place, and have not yet beheld this almost miraculous spectacle, will rejoice that it still keeps its center, and resists every effort to move it.
Yet if it was to fall I much wish to be a witness of its overthrow. So huge a mass precipitated, like the stone of Sisyphus, and rolling with prodigious ruin from precipice to precipice, over rocks into the sea, must afford a very striking spectacle.
Oh right. So after all that you'd actually like to see the big splash, very good.
from p115 of Tour Through the South of England, Wales, and Part of Ireland, Made During the Summer of 1791, by Edward Daniel Clarke (online at Google Books).
Borlase boldly said that it was 'morally impossible that any lever, or indeed force (however applied in a mechanical way)' could topple the rocking Logan Stone that was on the western side of the middle group of rocks here.
However, on the 8th April 1824, Lieutenant Goldsmith, who was in command of an armed vessel off the coast, decided that 'nothing could be impossible to the courage and skill of British seamen'. So by 'a continued application of [the] united strength' of himself and twelve men, they eventually slid it off its base.
"The sensations of all the neighbourhood were entirely at variance from those of the gallant officer; fears were even entertained for his life".
Luckily (so I understand?) Davies Gilbert (editor of the 'Parochial History of Cornwall' and 'sometime President of the Royal Society') had a quiet word with the Lords of the Admiralty, suggesting that he could help raise some money, and that the Admiralty might lend some capstans, blocks and chains from the Plymouth dock-yard, and Mr Goldsmith would have to help to put the stone back up again.
On the 2d of November, in the presence of thousands, amidst ladies waving their handkerchiefs, men firing feux-de-joye, and universal shouts, Mr. Goldsmith had the satisfaction and the glory of replacing this immense rock in its natural position, uninjured in its discriminating properties.
In consequence of the Editor [Gilbert] making a second application to the Admiralty, and of his commencing another contribution of money with five pounds, Lanyon Cromlech was also replaced by the same apparatus.
From a review of Gilbert's book, p273 in the 1838 Gentleman's Magazine.
Mentioned by Craig Weatherhill, in "Cornovia: Ancient Sites of Cornwall & Scilly" (Cornwall Books - 1985, revised 1997 & 2000) - "The magnificent headland was defended by one of Cornwall's finest Iron Age cliff castles. The outer defence is a deep ditch fronting colossal earth rampart 6.5m high and 275m long. 60m beyond this are two slighter ramparts and ditches. The outermost of those reaches a height of 2.0m, and the outer edge of its ditch has a faint counterscarp. The inner bank, originally stone-faced, makes use of a low ridge. The fourth and final line of defence is another deep ditch, backed by a heavy masonry wall, crossing the extremely narrow neck of the headland's tip. The inturned entrance retains its gate jambs, and behind it lie traces of two round houses. He appearance of the site suggests that there were two or three phases of construction."
Just off the coastal footpath, on National Trust openland.