A man used a sledgehammer and knife to murder his wife after drugging the couple's children so they would not witness the attack, a court heard.
George Kibuuka is accused of the "focussed" killing of his wife Margaret Kibuuka who was found at their Southampton home in November last year.
He denies murder and administering a drug to three of his children.
Mr Kibuuka, 48, admits the killing but his defence said it was because of diminished responsibility.
Winchester Crown Court was told that after the killing at the couple's Shirley home on 8 November last year, he then stabbed himself in the abdomen and took organophosphate pesticide, but was found by paramedics and survived.
Part-time carer Mrs Kibuuka, 40, had filed for divorce, claiming her husband had been violent towards her, but Mr Kibuuka did not accept the marriage was over and did not want to lose his considerable assets, the hearing was told.
The mother-of-four had complained to police about her husband's violence and emotional abuse in the weeks before her death, the court heard.
Nigel Lickley QC, prosecuting, said that Mr Kibuuka earned £90,000 a year from his job and owned four houses as well as land in his native Uganda, where the couple had married in 1987 before moving to the UK in 1990.
Mr Lickley said that on 7 November last year, Mr Kibuuka put sleeping tablets into the food and drink of the children and in the early hours of the next day and went to his wife's bedroom with the sledgehammer.
"The killing of Mrs Kibuuka was focussed, hence the severe and hard blows to her head with a sledgehammer and the deliberate cutting of her throat," Mr Lickley said.
Nigel Pascoe QC, defending, said in a brief address to the jury: "At the time of this truly terrible killing, the killer was a severely disturbed man."
The trial is expected to last four weeks.