Marius Borg Høiby, the son of the Crown Princess of Norway, has appealed against his criminal conviction, local media have reported.
The Oslo court handed down a four-year prison term on June 15 after finding Høiby guilty of two rape offences, violence against a former partner, and numerous additional charges totalling 34 in all.
His legal team is contesting the two rape convictions along with the abuse-related guilty verdict, according to Norwegian news agency NTB.
Prosecutors had originally pushed for a sentence exceeding seven years, while Høiby was cleared of two other rape allegations and two restraining order breaches.
Høiby has remained in custody since his arrest in February, which occurred on the eve of his trial and marked his fourth detention.
He has repeatedly sought release, citing concerns over his mother's declining health.
Crown Princess Mette-Marit received a pulmonary fibrosis diagnosis in 2018 and recently underwent a lung transplant at Oslo University Hospital, Rikshospitalet.
Following last week's verdict, another release application was turned down by the court.
Norwegian outlet Se og Hør reported that Høiby was nonetheless permitted to visit his mother at the hospital in recent days, entering through a rear entrance.
The Crown Princess is expected to remain there for the foreseeable future.
Høiby holds no official position within the Royal House of Norway, as he was born prior to Crown Princess Mette-Marit marrying Crown Prince Haakon.
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His stepfather addressed the situation publicly in January: "Marius Borg Høiby is not a member of the Royal House of Norway and is therefore autonomous.
"We care about him, and he is an important member of our family. He is a citizen of Norway and, as such, has the same responsibilities as everyone else - as well as the same rights."
The Royal House offered no commentary on the verdict itself, stating only: "The matter has been considered by the courts, and we have no comment on the outcome."
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