He's known as the man behind one of the worst attacks on Norwegian civilians in the country's history.
In July 2011, Anders Breivik detonated a bomb outside the parliament building in Oslo and killed eight people, before moving to a summer youth camp on the island of Utoya and killing 69 people, mostly teenagers.
Injuring a further 240 people, the killer showed no remorse when he appeared in court.
Credit: PA
Credit: PA
Now, Breivik has a new name - Fjotolf Hansen. It's a combination of a less-popular name with a more common one. There are over 52,000 people with the surname in Norway, but the first name choice, Fjotolf, is much less common.
The move, confirmed by his lawyer, came after an appeal by the killer against the 'inhuman' conditions in prison was rejected by Norway's Supreme Court.
His lawyer, Oeystein Storrvik, did not say why he had changed his name, instead keeping things very close to his chest.
Storrvik said: "He told me some reasons but I don't want to talk about what he told me."
A permanent memorial now stands on the island. Credit: PA
The decision has seen the Norwegian agricultural company that the killer created to make his bombs, Breivik Geofarm, is now registered under his new name.
Norwegians are allowed to change their names in the country's official register as long as they do not cause offence or harm to the person concerned.
In 2011, the white supremacist and anti-Muslim extremist posted racist material online, circulating a 1,500-page manifesto signed 'Andrew Berwick' - the English version of his name.
The manifesto featured pictures of him in uniforms with weapons. He sent it to 1,000 email addresses on the day he committed the twin terror attacks.
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Breivik is currently serving the fifth year of his 21-year sentence - a judgement which can be extended indefinitely - at Telemark prison in Skien.
He is held in the high security prison in isolation from other prisoners, and only receives visits from heathcare workers and guards. He is also enrolled as a full student on the bachelor degree programme for the political science course at the University of Osla.
Only five of his 300 letters written have not been confiscated within the prison as Breivik continues to protest (including hunger strikes) against the way he is treated.
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