No military background or training.
Described as a right-wing Christian extremist, with a hatred of Muslims.
Reportedly the author of a 1,500 page manifesto, called "2083: A European Declaration of Independence," critical of Muslim immigration and European liberalism.
He registered a farm in Rena, in eastern Norway, which allowed him access to large amounts of fertilizer.
The young people killed on Utoya island (Pronounced: Oo-TOY-ah) were attending a Labour Party youth camp. Most of the 700 campers ranged in age from 16 to 22, some as young as 13.
Norway does not have the death penalty
July 22, 2011 - At approximately 3:26 p.m., a fertilizer bomb explodes outside the building housing the office of Prime Minister Jens Stoltenberg. Eight people are killed in the bombing.
- After the bombing, Anders Behring Breivik takes a short ferry ride to Utoya island, approximately 20 miles from Oslo.
- Breivik, who witnesses say was wearing a police uniform, opens fire on young adults at a Labour Party youth camp. He roams the grounds of the island, killing campers trying to escape.
- At approximately 6:27 p.m., Breivik is taken into custody by members of an elite Norwegian police unit.
July 25, 2011 - Breivik attends his first court hearing, which is closed.
- His request to wear a uniform to court is denied.
- He is prevented from reading from his manifesto during the court hearing.
- Breivik claims to be working with two other cells of terrorists.
- Two court psychiatrists are assigned to the case.
- He is ordered to be held for eight weeks until his next court hearing.
- The first four weeks of detention will be in solitary confinement. He won't be allowed contact with anyone except his lawyer. He also will not be allowed mail or news.
August 19, 2011 - The families of the victims visit Utoya island.
August 19, 2011 - A judge rules that Breivik should be held in solitary confinement for another four weeks, until September 19.
September 19, 2011 - A judge rules that Breivik will remain in solitary confinement for another four weeks.
October 13, 2011 - The Oslo police announce that Breivik will leave solitary confinement within days.
November 14, 2011 - More than 500 people attend Breivik's first court hearing that is open to the public. Breivik is not allowed to deliver a speech he prepared, and the judge orders him held in custody for another 12 weeks.
November 29, 2011 - Police announce that Breivik is insane
, stating that psychiatrists had found him paranoid and schizophrenic. They say that he suffers from "grandiose delusions."
January 13, 2012 - Judge Wenche Elizabeth Arntzen announces that the court wants a second opinion from psychiatrists concerning Breivik's sanity.
February 10, 2012 - A Norwegian court orders that Breivik undergo a month-long 24-hour psychiatric monitoring as experts seek to determine his mental state ahead of a trial.
March 7, 2012 - Anders Behring Breivik is formally charged with committing acts of terror and voluntary homicide.
April 10, 2012 - Two psychiatric experts release their findings, which judge Anders Behring Breivik to have been sane at the time of the crimes. The findings state that during the commission of the crimes Breivik was not psychotic, not suffering from any psychiatric condition and is not mentally challenged.
April 16, 2012 - Trial begins.
April 17, 2012 - Judge Thomas Indrebo is disqualified for saying online that the death penalty is the right punishment for Breivik. Norway does not have the death penalty.
June 21, 2012 - A spokeswoman for the Norwegian Prosecutor's office confirms that prosecutors have asked for Breivik to be transferred to a psychiatric institution as they believe he is ill. If that does not happen, they have asked for 21 years in prison for him.
June 22, 2012 -
On the last day of his trial, Breivik addresses the court and describes his actions as "barbaric.
August 13, 2012 - An independent report finds that the terror attack could have been avoided. The report cites slow reaction times by police and security forces, under-staffing and the failure of leadership and communication.
August 24, 2012 -
Breivik is judged to be sane and sentenced to 21 years in prison. Twenty-one years is the maximum possible sentence, but it could be extended if he is considered to still pose a threat to society.
March 15, 2016 -
Breivik sues the Norwegian government for violating his human rights in prison. The proceedings are held in a prison gym rather than a courtroom because of security concerns.