Man Found Guilty of Raping Own Daughter, Fathering 6 Children Over 20-Year Period: One of the 'Worst Cases I Have Ever Had to Deal With,' Says Judge

A man has been found guilty of raping his own daughter and fathering at least six children with her over a 20-year period.

At Swansea Crown Court in Wales in the U.K., the man was also found guilty of repeatedly raping one of the children he had with his daughter, Wales Online reported.

The man cannot be identified to protect his victims. He was also found guilty of repeatedly raping another of his daughters.

He had denied 36 counts of rape and one of sexual assault, but was found guilty on all charges on Thursday.

The jury heard that the man had fathered "at least" six children with his daughter, who said she became pregnant with her first baby at the age of 14.

She said her father had told her he wanted to "teach" her how to have sex so she would know what to do with boyfriends. She didn't report the attacks to police until last year.

Prosecutors told the court that the man had manipulated his victims with elements of witchcraft and the occult—he created a fake mystic, called Amelia Sanctuary, who told the girls to perform sex acts with him, according to Wales Online.

The defendant admitted to having sex with his daughter from when she was 14, but claimed she later blackmailed him into continuing a sexual relationship.

Judge Paul Thomas told the defendant that he can expect a "very long prison sentence." The defendant is set to be sentenced on October 18, Wales Online reported.

Judge Thomas also said that the case was "one of the worst" he had ever dealt with. "I have been involved in criminal cases as a barrister and as a judge for 40 years," he told the jurors in court, according to Wales Online.

"This is in the top three worst cases I have ever had to deal with. I'm used to it, but for you to have to listen to this sort of evidence must have been a difficult experience."

In a statement obtained by Newsweek, Detective Chief Inspector Paul Jones, of Dyfed-Powys Police, thanked the victims for coming forward and for their "bravery and composure" throughout the trial.

"This man has been convicted of the most serious sexual offences, and it is very difficult to summarise the impact of his crimes upon his victims," he said.

"I wish to thank the victims in this case for their courage in coming forward. Their bravery and composure throughout this difficult trial has led to the conviction of a very dangerous offender, and I hope from today they can begin to move on and re-build their lives."

He added: "I want anyone who has suffered abuse to know that if you find the courage to come forward, you will be taken seriously, and police will work tirelessly to bring offenders to justice."

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Stock photo. A man has been found guilty of raping his own daughter and fathering at least six children with her over a 20-year period. Getty