Høiby, who pleaded not guilty to four charges of rape among 38 total accusations, was previously arrested for a violent incident at a woman’s apartment in Oslo, BBC reported.
The trial opens amid ongoing scrutiny of Crown Princess Mette-Marit’s connection to the late sex offender Jeffrey Epstein, which has led to criticism and a loss of patronage from a charitable organization.
Just before the trial, Høiby was detained again on suspicion of assault and violating a restraining order, and he began the trial in custody, pending an appeal from his defense team. Heavy restrictions are in place regarding media coverage, including a ban on photographing Høiby. As the charges were read, he partially admitted to some offenses while denying the more serious allegations.
The royal family will not attend the trial, adding to a sense of isolation surrounding Høiby. Born before his mother married Crown Prince Haakon, he is considered close to the royal family but is not an official member or public figure. The trial has drawn significant public interest in Norway and beyond.