The following is from author Tom Sleman's website
The Strange Case of the American Knights

In August 1972 a respected New York hypnotherapist named Donald Ketticott regressed a retired property developer from Palm Springs named George Freemont. Freemont had been visiting a cousin in the Big Apple and had decided to pay a visit to Ketticot's surgery on East 26th Street to book an appointment, but was surprised when Ketticott asked him if he wanted to have a 'quick taster' of hypnotic regression.

Freemont said he would and that he'd like to be regressed to a certain summer's day in 1910 when he was just seven years old. Ketticott asked Freemont why he wanted to be taken back to that day, and the latter explained that upon that date he had experienced a strange vision which had haunted him all of his life. He had been hiking with his father through the woods near Lake Tahoe in California when he had felt an intense urge to turn around. Upon turning, young George Freemont saw a knight in armour carrying a lance, mounted on a white horse. The apparition was shimmering with a golden light, and the knight, who wore a crown, smiled and said something. George had forgotten what it was the vision had said, and seconds later it had vanished, leaving the boy with an unbelievable tale to tell.

Ketticott acted strangely when Freemont related the strange episode from his childhood. He took out a notebook and scribbled something down, then enthusiastically went to the windows and pulled down the blinds. He told Mr Freemont to relax on the chesterfield, and within a couple of minutes, the retired Californian was in a hypnotic trance.

'Go further back, further to that day George. Fall through time, fall through the years back to that sunny day. You are there now.' Ketticott intoned in a gentle but reassuring voice.

'I am there. I'm with my father. The sun's in my eyes.' said Mr Freemont. His eyes were closed and his breathing rate was very slow.
'Move on to the moment when you see that vision. Move on.' Ketticott told him.
'Wow.' George Freemont's mouth opened and his face looked like the face of a surprised schoolboy who was in awe of something.
'Now listen to the vision.' said Ketticott softly 
George Freemont suddenly started speaking in an unknown language. It had elements of Latin and French in it, and as Freemont uttered the strange tongue, he lifted his hand and made a fist, as if he was saluting someone. In a deep voice Freemont said: 'Arturus Rex.
At that point Ketticott brought the Californian out of the trance and asked him what he had learned. Freemont was quiet for a few minutes, then said that upon that summer's day long ago he had encountered a glowing vision of his 'master' - King Arthur. Arturus Rex, the words Freemont had uttered when he 'saluted' the vision were Latin for King Arthur. Ketticott asked him what the vision had said on that sunny afternoon.

'He told me that I was the reincarnation of one of his knights. He said I was Tristram, one of his most valiant men, and he told me that three other knights had been reborn in America and that I should try to seek them out.' George Freemont expected the hypnotherapist to laugh at the incredible claim, but Donald Ketticott told the retired Californian a bizarre tale.

Ketticott said, 'Just over a year ago I regressed a policeman who works right here in New York. He had recurrent nightmares since his childhood about being run through with a sword. The nightmares were so lucid, the policeman could actually feel the agonising pain and terror as the sword went through his torso. These nightmares began to effect his work, so he sought psychiatric help. A friend of mine tried psychoanalysis but that had no effect so he referred the policeman to me. That policeman said that when he was a child of about eight or nine, he was awakened on several occasions by a mysterious presence in his bedroom. The eerie glowing figure of a man in a crown would appear at the foot of his bed and smile at him. Well, I regressed the policeman and he told me that in a previous life he had died in a bloody battle as a knight; a knight of King Arthur named Gareth. Under hypnosis he said that when he would awake from the nightmare he would see the golden vision of Arthur standing near his bed with a reassuring smile.'

George Freemont was fascinated with Ketticott's story and asked if it would be possible to talk to the policeman in question.

Dr Ketticott was reluctant at first but later arranged for Freemont to meet the policeman. According to Ketticott, the two men became the best of friends and made many visits to England to see the historical sites where King Arthur and his men lived and fought. The two 'reincarnated knighknights' also travelled to what they claimed was the final resting place of their King - the Blessed Isle of Avalon - nowadays known as the Isle of Man.ts' also travelled to what they claimed was the final resting place of their King - the Blessed Isle of Avalon - nowadays known as the Isle of Man.