Court ruled he had been subjected to 'inhuman and degrading treatment'

The 37-year-old is sued Norway over his '

Mass murderer Anders Behring Breivik's human rights have been violated during his imprisonment, a Norwegian court has ruled.

Breivik won parts of his lawsuit against the Norwegian state, in which he listed being fed the same food two days in a row, and being kept in isolation, as proof of 'inhuman treatment'.

The 37-year-old's conditions at Skien prison, 87 miles south of Oslo, breached an article in the European Convention on Human Rights prohibiting inhuman and degrading treatment, Oslo district court said.

Mass murderer Anders Behring Breivik won parts of his lawsuit against the Norwegian state over his prison conditions, in which he claimed his 'human rights' had been violated

'The prohibition of inhuman and degrading treatment represents a fundamental value in a democratic society. This applies no matter what - also in the treatment of terrorists and killers,' judge Helen Andenaes Sekulic said in her ruling.

The ruling also said the Norwegian state had not violated the right of Breivik, who killed 77 people and injured 300 in the 2011 massacre, to have a private life and a family life.

In his lawsuit, Beivik had stated that he had been a 'victim of cruel and inhuman treatment' in Skien prison, where he has an entire cellblock to himself and access to a computer and PlayStation.

During court proceedings Breivik claimed to have been 'treated worse than an animal', complaining about cold coffee, having to use plastic cutlery.

'Sometimes I've been fed the same microwave meal two days in a row. It might sound comical [to you, but it's worse than waterboarding,' the Nazi terrorist told a court earlier this month.

Norwegian mass killer Breivik had sued Norwegian authorities of violating his human rights by holding him in isolation for almost five years

Making his case: Addressing the court last month, The 37-year-old listed being fed the same food two days in a row as proof of 'inhuman treatment'

'Cruel and inhuman'?: Breivik has an entire cellblock to himself at Skien prison, with three cells, access to a computer and a PlayStation, as well as a yard and permission to cook his own food

Taking the stand for his first public statement since his sentencing in August 2012, Breivik said he was the secretary of an extremist party he is trying to create, the Nordic State Political Party.

He also compared himself to anti-apartheid leader Nelson Mandela, saying the only difference between them was that Mandela 'ordered action,' while he had been the one to 'carry out the action,' CNN reports.

Addressing the court, he vowed to fight 'to the death' for Nazism, confirming fears he would use the platform to grandstand his extremist views.

'I have fought for National Socialism for 25 years, and I will fight for it to the death,' he said of the Nazi party's political doctrine.

It was considered too dangerous to hear the case in an Oslo court, and proceedings have instead been held inside Skien prison's gymnasium, which was turned into a courtroom for the case.

Survivor Dag Andre Anderssen, deputy leader of a support group for survivors and the bereaved, called Breivik a 'unique' inmate in Norway's prison system, which is focused on rehabilitating rather than punishing criminals.

'They say that every society is measured by how they treat their prisoners so we will allow him to use the system, to try to use the system against us,' Anderssen said.

'But I think the system will say that his conditions are as good as they can be.'

Mass killer Anders Behring Breivik raises his arm in a Nazi salute as he enters the gym-turned-courtroom in Skien prison, south-west of Oslo last month

Murderer: Anders Behring Breivik, who killed 77 people in 2011, is suing Norway, claiming his solitary confinement in Skien prison, south of Oslo, is 'cruel and inhuman treatment'

Breivik's suit was heard in Skien prison's gymnasium, which had been turned into a courtroom for the day

Breivik murdered 77 people and injured more than 300 - many of them teenagers - in July 2011, by detonating a bomb in downtown Oslo and carrying out a mass shooting on Utoya Island.

The Norwegian Correctional Service denies Breivik is held in solitary confinement, preferring the phrase 'excluded from the company of other prisoners' - as he disposes of an entire block.

At Skien prison, Breivik lives in three different cells - for living, study and exercise - between which he can move freely.

He also access to a computer, which is not connected to the internet, as well as his own television and a PlayStation.

The right-wing anti-muslim extremist is also free to take walks in a yard at his leisure and he can cook his own food and do his laundry should he so wish.

'There is no evidence that the plaintiff has physical or mental problems as a result of prison conditions,' the Office of the Attorney General, the Norwegian state's legal office in civil lawsuits, wrote in a document sent to the Oslo District Court and released on Wednesday.

Breivik was sentenced to 21 years' imprisonment with preventive detention in 2012, and has been kept in isolation since his arrest.

There is no maximum time for how long he can be held in such 'extra high security', a Norwegian prison service official said.

Norwegian mass killer Anders Behring Breivik sits next to his lawyer Oystein Storrvik, right, at a makeshift court in Skien prisons gym

The Norwegian Attorney General has denied Breivik's claims, saying there is no evidence of the murderer suffering from the conditions under which he is being held at Skien (pictured)