A monk-like figure appeared in the stonework at the Gowers' home
Phenomena took place at the former home of the Gower family so regularly, they became accustomed to the events which seemed to focus on a ghostly monk they came to know as Brother Doli.
All around the house in Treuddyn, near Mold, graffiti in the form of stains and carvings began materialising on the walls, on the mantelpiece, even imprinted on the lawn.
First, scrawled on the fireplace, the word "tangnefedd" appeared overnight. It is an ancient Welsh word meaning religious peace.
It marked the start of a series of paranormal daubings and when life on the farm began to get very strange.
So much so that throughout the late 1990s the ghost, the house and the Gowers found themselves in the spotlight with the media and academics interested to get to the bottom of what was happening.
One night, Rose-Mary Gower's daughter Adrienne saw the form of a monk shuffling about at the bottom of her bed.
Rose-Mary herself saw a shadowy figure in the garden. It shared the bedroom of John-Paul, her son, who thought of him simply as a friend. John-Paul, who has Downs Syndrome, said, at the time, he saw this monkish apparition as often as the family cat.
That was some time ago and although the family no longer live at the house, they'll never forget about the ghost they called Brother Adophus or Brother Doli for short.
John-Paul once saw Brother Doli in the garden patting Aslan. The family Alsatian had died some time before and had been buried in the garden.
Brother Doli even played pranks on visitors, appearing in photographs, but it was the stains on the walls that took on shapes like an outline of a monk as well as the wall writing that perplexed the Gower family most.
It was all in Welsh, and, as they weren't Welsh speakers, they bought a dictionary to translate it. Over time, the words IACHAD (healing) and FFYDD (faith) were carved into the stone.
Rose-Mary Gower says her family became used to Brother Doli's antics
"The carvings were amazing - we discovered no evidence of stone chippings or dust!", said Rose-Mary when interviewed in 2001.
Six weeks after Aslan died the Welsh word for dog, "ci", appeared on the kitchen wall.
Rose-Mary said: "The words GWEDDI (prayer) and PADERAU (rosary) materialised before our eyes - one minute nothing was visible, the next these words were there.
"When the word CANNWYLL (candle) was photographed the word MYNACH (monk) appeared on the photo but not on the wall!"
They were the very devil to remove (Rose-Mary tried bleach), but they seemed to come and go by themselves.
A friend who went to stay found the word "tangnefedd" inside his computer laptop lid when he returned home.
A reporter's return train ticket went missing and was found, complete with Celtic graffiti, behind the mantlepiece clock.
The word "mynach" was cut into the lawn and the "millennium" and "2000" also appeared. Watches and clocks of visitors seemed to run slow.
The Gowers, and especially Rose-Mary's science-trained husband, became totally intrigued.
A film crew brought along a "sensitive", Elwyn Roberts, who sat down with a piece of paper. Automatic writing sped across the page and the paper was actually embossed with the Welsh word for joy.
But Elwyn also felt he could visualise Brother Doli's dreadful fate. He saw a monk kneeling by a river, his hands raised in self-defence; a swordsman on horseback; the glint of steel; frantic and vain efforts to ward off the blows.
He had the strong feeling that Brother Adolphus felt he had died far too young and had appeared to the Gowers because they were "sympathetic".
The year of his death, he said, was 1613. Carved into the lintel of the Gowers' cottage is the date 1610.
They contacted a local archivist who couldn't find a nearby monastic settlement. But the home could well have lain on an ancient pilgrim route from the abbey at nearby Vallé Crucis.
The Gowers emphatically deny they hoaxed the haunting which ended in March 2001. In fact, the couple seem genuinely mystified. And others witnessed the graffiti appear before their eyes.