A man who discovered his wife was having an affair threatened to electrocute her during a terrifying ordeal.
Gerald Brown repeatedly punched his partner, "whipped" her with a belt and warned he'd kill her with a knife.
Liverpool Crown Court heard the 59-year-old also said he would do the same to their dogs and attacked one pet.
Brown, of Wood Street, Litherland, always denied carrying out any attack on the frightened mum-of-four.
But he was found guilty of assault causing actual bodily harm after a trial at Liverpool Crown Court.
Martine Snowdon, prosecuting, said photos showed the injuries she suffered during the "sustained assault".
Judge Robert Trevor-Jones told Brown: "The background to this assault was of course the discovery of your wife's affair, during the late part of Boxing Day 2018.
"I accept that after 30 years of marriage and with no obvious dispute or estrangement involved, that will have come as a devastating shock to you."
He said Brown "reacted as might be expected" with "distress and anger" and demanded to know the full details.
However, his wife didn't want to disclose them, which he said "inflamed" matters as far as Brown was concerned.
The trial heard she admitted to the affair after her husband became suspicious about her putting a lock on her phone, and when she refused to unlock it, he dropped the device in a fish tank.
The judge said Brown then summoned their adult children to their home, and showing his "self-centred attitude", humiliated his wife by exposing her affair in their presence.
Judge Trevor-Jones said over the next few days Brown "alternated between hostility and affection" during his perhaps "understandable sense of confusion".
He said Brown suggested they go for a day out to Southport, before they stayed at a hotel in Lytham St Annes, then had a night away in Harrogate.
But during this time Brown continued to question her about the affair and used "abusive and demeaning" words towards his wife, who the ECHO has chosen not to name.
The couple went as planned to a New Year's Eve party, but beforehand Brown put his wife's SIM card in his phone.
Judge Trevor-Jones said Brown read messages between his wife and her new man and spent the evening drinking.
When they got home, he threw her to the floor and hit her, and when she pleaded "why?", replied "you're a s**g" and smacked her to the head.
The jury heard he got a knife and told her he was going to kill her and to look at him, so he was the last person she saw before she died, before threatening to kill their dogs and attacking one of them.
She made him stop and Brown dragged her upstairs, punched her, returned with a knife and said he would kill her and then himself.
The trial heard he then whipped the back of her legs with a belt and put it around her neck, as she said how "sorry" she was.
Judge Trevor-Jones said Brown picked up a bedside table lamp and was "threatening to electrocute her with that" by smashing it and putting it "in her mouth".
He said: "It was obviously a very chilling and frightening situation and no doubt terrifying as far as she was concerned".
The judge said Brown made an attempt to hang himself, but this "came to nothing".
He said Brown then prevented his wife from leaving until the morning, when they were due to collect their grandson.
The victim said she would drive because he had drunk too much but then locked the doors of the car and drove to her daughter's house.
Judge Trevor-Jones said the victim rang 999 "while cowering in her daughter's bedroom".
Ms Snowdon said she had declined to make a victim personal statement.
Sarah Holt, defending, said her client was 60 next month and while he had some previous convictions, they were "entirely dissimilar", and the last was in 1994.
She said none were for violence and there was no history of violence in the relationship, which was confirmed by the victim and the police.
Ms Holt said it was "an incident that was very much out of character" and it had been a difficult time for the family and for her client.
She said during the incident Brown tried to harm himself, adding "that's been something of an ongoing theme since", and he had now "lost everything".
Ms Holt said: "The marriage has ended, the divorce has gone through, there's been no further incidents at all.
"The relationship with his children has broken down, irretrievably with at least two of the children, possibly with all four of them. He's lost his home and may still lose his employment."
The lawyer said Brown, who was in "poor" health, had always worked hard to provide for the family.
She said the Probation Service believed he was a low risk of reconviction and if spared jail, he could undertake a recommended course to help his rehabilitation.
Judge Trevor-Jones said he had read a pre-sentence report and told Brown: "You remain in denial about what you did."
He said Brown hadn't accepted the extent of the attack and felt aggrieved about "the division of matrimonial assets".
The judge said the attack was aggravated because it happened in his victim's home, which she was "forced to flee".
He accepted mitigating features included his lack of previous violence and ill health, but said a prison term was the only appropriate punishment as he jailed Brown for 12 months.
If you have been affected by any issues mentioned in this article, you can contact the Domestic Violence Helpline for free on 0808 2000 247.
