His solicitor Oeystein Storrvik told a hearing that the far-Right fanatic “has been isolated for about 12 years” as he serves Norway’s maximum prison sentence of 21 years for the country’s worst peacetime atrocity.
The lawyer told the hearing, set up in the gym of the high-security Ringerike Prison: “He is only in contact with professionals, not with other inmates.”
Breivik, 44, is reported to spend his time in a dedicated section of the jail, the third he has been held in.
His living area there includes a kitchen, TV room and bathroom, it has been revealed, and he is allowed to keep three pet budgerigars, which fly freely within his area.
Lawyers for the Norwegian justice ministry argue the killer must be kept apart from other inmates at the jail because of the continuing security threat he poses.
Breivik killed 77 people in Norway in 2011 after emailing copies of a manifesto setting out his extremist theories.
He slaughtered eight people with a car bomb in the capital Oslo before shooting dead 69 others 24 miles away at a Workers’ Youth League summer camp on the island of Utøya.
Most of his victims were teenagers.
The murderer was famously cited as an inspiration to Brenton Tarrant, who killed 51 people in two mosques at Christchurch, New Zealand, in 2019.
The judge’s verdict on Breivik’s plea will be issued in the coming weeks.
Breivik said nothing as he appeared wearing a black suit, white shirt and brown tie at the hearing in the jail near the southern village of Tyristrand, 40 miles north west of Oslo.
