One of the best known stories tells of a giant named Cormoran and his wife Cormelian,They had thier homes in the forest that ounce covered Mounts bay between Penzance and Marazion.
Cormoran intent on building himself a stronghold of white granite, forced his wife to carry the boulders in her apron.
One day Cormelian seeing her husband asleep decided to bring back greenstone instead as it, was much closer to hand, but Cormoran awoke and caught her, enraged he kicked her and broke the apron strings and the greenstone dropped.

According to legend, Jack was a farmer's son who lived near Land's End .
The folk of the area were being terrorised by Cormoran ,the Giant of St. Michael's Mount,who stole cattle and carried them away .
.A reward was offered to anyone who could slay the fearsome giant,and Jack took up the challenge
.He dug a huge pit near Morvah and covered it with sticks and straw.Then he lured the Giant away from the Mount by blowing his horn.The angry Giant rushed down the Mount and fell into the pit.Jack then struck him a mortal blow with his axe and filled the pit with earth.For this deed he was given a magnificent sword and belt. Embroidered "Who slew the Giant Cormoran"Famed for his bravery Jack became something of a hero ,killing wolves and pirates in addition to troublesome giants.Later he travelled on to Wales to slay more of them and further embroidered his legend,

GIANT BOLSTER
Giant Bolster was said to be able to stand with one foot on St.Agnes Beacon and the other on
Carn Brea a stride of around 6 miles

The mighty Bolster fell in love with St.Agnes a beautiful and vertuous missionary.
The Giant followed her everywhere proclaiming his love, but Agnes would only lecture him on his impropriety as he was a married man.
At last the SAint decided to rid herself of him and asked him to prove his love by filling a hole at Chaple Porth with his blood.
Bolster convinced that it would take little of his bood to fill such a small hole instantly plunged a Knife into his arm and put it in the hole, The blood ran for hours but the hole was not filled.
What St.Agnes Knew and he did not was that the bottom of the hole opend out to the see.
At last Giant Bolster drained of bood died. The hole is still at Chaple Porth and a red stain marks the cliffs where Bolsters blood ran out to sea.

Piskies where considered to be on the good side of folklore

ThePiskies were all identical little old men, no higher than an inch tall. They wore red caps, white waistcoats, green stockings, and brown coats and trousers. On their feet they wore brightly polished shoes buckled with glitering Dew-drop. The Piskies were good people who helped the old and sick and twas said rode upon the backs of snails, but they were mischievous and played pranks on people.If a parent did not keep an eye on thier children then the piskies would take the child away only to return it later cared for and in fine health as a reminder to parents not to be neglectful of thier charges

...Spriggans

Then there were the Spriggans. they were ugly and were feared. They had large ugly heads on small bodies. They raised whirlwinds to damage the crops, and terrified the lone traveller
They even stole babies to replace thier own and left thier own ugly ones in it's place,they were said to inhabit the cliffs, tors and cairns anywhere where old treasure may be found

 

Knockers

The Knockers were mostly good but if not shown the respect of others would cause trouble for those involved it was often thought to be the knockers who lead the way with thier digging to the richest viens of tin at the bottom of the mines or a sound to be followed may save a miner from a cave in.
Yet if they were spied upon or if you never left a piece of your meal even if they asked for it,it would be at the miners peril they were suposedly able to cause cavins rockfalls and finally the closure of a mine.

There is little doubt that Jan Tregeagle realy existed in the early 1600 ,he was an unpopular magistrate who used his possition for personal gain and is believed to be buried in St.Breock churchyard.
Legand has it that he was to be called from the grave to give witness in a local court case that he had handled before his death.
When crossexamined he revealed that he had fraudulently made over land title to himself.
The inocent defendant having won his case left Tregeagle to be delt with by the court, who then called the clergy to set penance, not wanting to give him over to the Devil they set a task to empty Dozmary Pool a suposedly bottomless lake on Bodmin moor with a limpet shell with a hole in it that would take him for ever and as long as he worked at it he would be safe from the Devil.
He was kept at his labours buy a pack of headless hounds waiting to carry him off if ever he ceased his toils
One night in fear of a raging storm Tregeagle ran off chased by the headless pack of hounds he eventualy made it to Roche rock but could only get his head inside the hounds tore at the rest of his body .

The screams of Tregeagle could be heard for miles eventualy the local priest with the aide of two saints took Tregeagle to Padstow beach where the saints set him the task of weaving ropes from the sand ,but every time the tide came in the ropes where washed away and his screams of frustration gave the locals many sleepless nights

In time St.Petroc was called by the people of Padstow to help, St Petroc forged a set of chains and forced Tregeagle to Berreper near Helston ,here Tregeagle was set the task of carrying bags of sand across the Loe estuary to Porthleven until the beach at Berreper was free of all sand. It was here that while carrying a load of sand that he was tripped by a Demon which spilled sand across the bay. (Still to be seen today and is Known as Loe Bar.
Again Tregeagle was forced to move on by the angry locals this time to Lands End this time to clear the sand from Porthcurno cove to mill Bay.
If you go down to Lands End late on a stormy night it is said that you may here Jan Tregeagles screams of rage as he battles against the Atlantic to complete his task