Biography: Marius Borg Høiby, born on January 13, 1997, in Oslo, is the son of Crown Princess Mette-Marit of Norway from an early relationship with financial analyst Morten Borg. His mother is married to Crown Prince Haakon Magnus of Norway, making him the half-brother of Princess Ingrid Alexandra and Prince Sverre Magnus. In July, Marius Borg Høiby was sentenced to four years in prison for a total of 34 offenses.