Marius Borg Hoiby, the 29-year-old son of Norway’s Crown Princess Mette-Marit, has been sentenced to four years in prison following an Oslo court verdict.
The court found him guilty of two counts of rape.
He was born on January 13, 1997 in Kristiansand, Norway, and is the son of Crown Princess Mette-Marit of Norway and her ex-boyfriend, Morten Borg.
Her half-brother and sister are Princess Ingrid Alexandra, who is the heir apparent to the Norwegian throne, and Prince Sverre Magnus.
Høiby studied at WANG Toppidrett Oslo from 2013 to 2016 and also enrolled at California-based Santa Monica College in 2017.
When his mother married Crown Prince Haakon in 2001, Høiby was already four years old. However, Høiby bears no royal title and is not part of the royal succession.
In the rape trial
Hoiby was first arrested in August 2024 in the Frogner district of Oslo after a domestic assault. Police later expanded the scope of the case to 32 charges, eventually reaching 40 charges.
The charges included four counts, including r*pe, drug offense and traffic violations.
In June 2025, his case was passed to prosecutors and a formal indictment followed in August 2025. His trial lasted seven weeks, beginning on February 3, 2026.
Prosecutors sought seven years and seven months in addition to 580,000 crowns ($60,840) in compensation.
For now, Hoiby plans to appeal.
