Like other Scandinavian monarchies, Norway celebrates the birthdays of members of the royal family. These days are called flag days (holidays and memorable dates, in honor of which the state flag is raised in the places established by law).
On September 22, Norway celebrates the birthday of Princess Martha Louise (Märtha Louise, September 22, 1971), the eldest daughter of King Harald V of Norway and Queen Sonja.
Martha Louise was the first child of Crown Prince Harald and his wife Princess Sonja (later King Harald V and Queen Sonja). On February 1, 2002, she voluntarily lost her title, thus freeing herself from the need to perform representative functions and forfeiting royal privileges and possessions.