A 48-year-old man who raped his girlfriend and her 60-year-old mother has been sentenced to life in prison after a judge said it was the worst case he had ever come across. 

Mr Justice Patrick McCarthy said the extremely violent attacks meant it was one of those exceptional cases where a life sentence was appropriate despite a guilty plea.

He imposed eight life sentences to be served at the same time for a number of rape and related offences.

The Waterford man, who cannot be named to protect the identity of his victims, had previously served a nine-year sentence for raping his own daughter from a previous relationship.

At the time of these offences, which took place over three days at three locations in Dublin in July 2015, he was on bail for kidnapping and seriously assaulting the same girlfriend the previous year.

The ordeal began in July 2015 when became violent towards his girlfriend during sex.

He then raped her and the following day locked her in a bathroom at a hostel and repeatedly raped, abused and threatened her.

His girlfriend eventually fled to a friend's house.

The following day the woman had a missed call from the man.

When she listened to her voicemail she could hear her mother in the background.

The man had broken into her mother's home and threatened her with a Stanley knife. 

He then tied her up and subjected her to an extremely violent physical and sexual attack for almost three hours.

During the ordeal he threatened to kill her and slit her throat and said he was waiting for her daughter to come home so he could do the same to her.

During the attack he repeatedly phoned the woman's daughter but the calls were not answered, leading to the recording on her voicemail.

The court was told the woman passed out a number of times during the ordeal and was praying her daughter would not come home.

Gardaí were alerted by the woman's daughter after she heard her mother in the background of the voicemail.

As officers banged on the door the attacker told the woman he would kill her.

Gardaí then broke into the house and chased the man into the back garden.

He was pepper sprayed after refusing to drop the knife.

The court was told the woman was left "unbelievably traumatised" after the attack and now felt like a prisoner in her own home.

Her daughter had described the attack as "a night of horror" when her fear was unimaginable.

She said she her life had changed and her mental health was affected.

Mr Justice McCarthy said the older woman was a "reserved lady" whose home was once her sanctuary but she no longer felt safe there.

In garda interviews the man made some admissions but claimed the mother had invited him in and that she was lying about certain aspects of the attack.

The father of four later pleaded guilty at the Central Criminal Court to raping the two women in various ways between 2 and 5 July 2015 at locations in Dublin.

He also pleaded guilty to false imprisonment, attempted rape, aggravated burglary, making threats to kill and aggravated sexual assault.

Defence counsel Dominic McGinn said his client had told him not to minimise the seriousness of the offending.

He said he had some insight into his offending and was on the waiting list for psychological treatment in prison.

If you are affected by any of the issues raised in this report, help is available at the Rape Crisis Centre at 
1800 77 88 88