Hallvard Vebjørnsson was an 11th-century Norwegian martyr who is honored as the patron saint of Oslo. Born around 1020 to wealthy farmers in Lier, he was reportedly related to the mother of Saint Olaf. He is remembered for his fatal decision to protect an innocent pregnant woman, likely a thrall, who had sought sanctuary. According to tradition, Hallvard died near Drammen after being killed by men who pursued the woman he was shielding on his boat.