Who Is Marius Borg Høiby? Inside the Norway Royal Son Facing 40 Criminal Charges and Assault Allegations

Marius Borg Høiby, the eldest son of Crown Princess Mette‑Marit, is at the centre of one of Norway's most closely watched criminal trials in recent years. At 29, Høiby faces roughly 40 charges, including rape, sexual assault, domestic violence and breaches of restraining orders, drawing significant national and international attention. The trial has reignited debate about privilege, accountability and the scrutiny faced by those connected to the royal family.

Trial Under Way in Oslo

Høiby's trial began at Oslo District Court in early February 2026. Prosecutors allege four counts of rape, intimate partner abuse, threats with a weapon, violent conduct and other serious offences. He has pleaded not guilty to the most serious allegations, including the rape charges, while acknowledging some lesser offences.

Court records show Høiby was first arrested in late January over assault, threats with a knife and violating a restraining order linked to an incident in his Oslo apartment. He has admitted to reckless behaviour and breaching the restraining order for which he was charged.

A Controversial Profile

Born in Oslo in 1997, Høiby is the only son of Crown Princess Mette‑Marit from a previous relationship. His mother married Crown Prince Haakon in 2001, making Høiby the stepson of Norway's heir to the throne. Despite his family ties, he holds no formal royal title or official role.

The trial has attracted intense media attention both in Norway and abroad. Prosecutors outlined dozens of offences early in the proceedings, highlighting serious violent crimes alongside a broader pattern of alleged misconduct.

Courtroom Developments

In early March, prosecutors added new counts for reckless conduct and violating a restraining order, bringing the total number of charges close to 40. Testimony from alleged victims described physical aggression and intimate partner violence.

One of the few identified alleged victims is former girlfriend Nora Haukland, who Høiby denies abusing. Court testimony claims he kicked, punched and choked her from 2022–23. An audio recording reportedly captured Høiby hurling abuse. His defence counsel maintains she did not 'live in a regime of fear'. If convicted of serious charges, he could face over 10 years in prison, as reported by BBC.

Another former partner, protected by court order, described a turbulent relationship marked by repeated abusive behaviour. Courtroom observers said the testimonies were detailed and grave.

Public and Royal Response

The case has prompted debate about the Norwegian monarchy and public accountability. Polls suggest declining confidence in the royal family, with commentators questioning privilege and transparency.

The Royal House has emphasised that Høiby is not a member of the official royal family. Both Crown Princess Mette‑Marit and Crown Prince Haakon will not attend the proceedings. Officials stress that Norwegian law applies equally to all citizens, regardless of background.

Next Steps

The trial is expected to continue through mid‑March 2026. If found guilty of the most serious charges, Høiby could face more than a decade in prison under Norwegian law. Legal analysts say the case may set a precedent for how the justice system treats high-profile defendants and influence ongoing discussions about crime, consequence and public trust.