He had pleaded guilty to two charges of assault occasioning actual bodily harm, three of indecency with a child and two of indecent assault.
He also admitted two charges of rape of a child under the age of 13.
The court heard he had beat one of his victims and hit her with a riding crop before going on to sexually assault her from the age of seven.
"The victim confided in a friend about what had happened in 2014," she said. "She has been badly affected by it emotionally – at the time she had been too afraid to tell the police – too afraid to tell anyone. What was happening to her became normal."
The court heard Kingdon went on to target a second victim, touching her and making her touch him from the age of around five.
"She didn't tell anyone what he was doing because she was afraid that people wouldn't do it," Mrs Coombes said. "Every time he abused her, he said it would be the last time."
She said the woman had suffered a number of mental health problems, including depression, self-harming and an eating disorder.
But sickeningly, while police investigated the complaints against him, Kingdon went on to abuse and rape another child.
The child was overheard whispering to Kingdon and when questioned about what they had been talking about became tearful, saying she could not tell anyone or she would be in trouble.
She went on to make a number of disclosures about the abuse and rapes she had suffered at Kingdon's hand.
When the girl's mother confronted Kingdon, he told her: "I'm sorry. I f***** up."
Kingdon, who appeared in the dock in custody but is originally from Yeovil, had initially denied the charges, before changing his pleas to guilty.
Defending, Derek Perry said there was little he could offer in way of mitigation, other than that Kingdon had not taken the case to trial.
"He knows the sort of sentence he is facing today, but he still pleaded guilty," he said. "He's disgusted by his behaviour."
Sentencing him to 22 years in prison, Judge David Ticehurst said: "Between 1998 and 2006, you committed these terrible offences against young children. You physically and sexually abused them.
"You were arrested and while you were on bail, you committed further offences on another child. You raped a 10-year-old girl.
"It is impossible to know the extent of the damage you have done to these three young people. The harm you have caused them will remain with them for the rest of their lives.
"You have shown a pattern of sexually despicable behaviour. I am satisfied that you pose a substantial risk to young children. I am satisfied you are a dangerous individual."
Kingdon was sentenced 18 years for each of the rape charges and an extra year on license, with both sentences to run concurrently. For the ABH charges he was given a concurrent sentence of six months and 12 months consecutively for the charges of sexual assault. For three charges of gross indecency with a child, he was sentenced to 12 months concurrent.
His total sentence was 22 years and he was made the subject of a sexual harm prevention order for the rest of his life, and will remain on the sex offenders register until the day he dies.
He was also ordered to pay a £170 statutory surcharge.
As he was sent down, Judge Ticehurst told him:" You are a wicked man. You should be thoroughly ashamed and disgusted with yourself – as all right-thinking members of society are."
Speaking after the sentencing, an NSPCC spokesperson for South West England said: "Kingdon's sickening offences represent an extremely serious case of child sexual abuse and it's right that he's now behind bars.
"His extensive crimes robbed his defenceless victims of their childhood and could have a lasting impact well into their adult years
"Abuse can ruin childhoods, so it is vitally important that these victims are able to benefit from support services in order to recover from this horrific episode.
"We would urge any adult concerned about the welfare of a child or young person to call our helpline for free, 24/7, on 0808 800 5000. Meanwhile, children can call Childline on 0800 1111."
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