King Harald V of Norway, Europe's oldest reigning monarch and a cousin of Britain's King Charles III, has died at the age of 89. The royal passed away after a brief hospital stay at Oslo University Hospital, where he was being treated for haemolytic anaemia, a condition that causes red blood cells to be destroyed rapidly. The palace announced that his health had deteriorated due to a contracted infection.

Harald ascended to the throne on January 17, 1991, and was Europe's longest-serving monarch following the death of Queen Elizabeth II in 2022. He was born on February 21, 1937, the only son of King Olav V and Princess Martha of Sweden.

His early life was shaped by World War II. When Nazi Germany invaded Norway in April 1940, a three-year-old Harald and his two older sisters were sent to Sweden with their mother. His father and grandfather remained in Norway to support the resistance before they too fled to London, joining the Norwegian government-in-exile. The young prince and his mother and sisters then spent the remainder of the war in the United States, living in Washington D.C.

The royal family returned to Norway in June 1945 after the defeat of Nazi Germany. A personal tragedy struck in 1954 when Harald's mother died of cancer at the age of 17. Three years later, his grandfather King Haakon VII died, and Harald became Crown Prince.

Harald studied at the University of Oslo and the Norwegian Military Academy, graduating in 1959. It was at his graduation ball that he met Sonja Haraldsen, the daughter of an Oslo draper. Despite initial objections from the palace due to her commoner status, Harald eventually married Haraldsen in 1968. The couple had two children: Princess Märtha Louise, born in 1971, and Crown Prince Haakon, born in 1972.

An accomplished athlete, Harald represented Norway in sailing at the 1964, 1968, and 1972 Olympic Games. He was also a keen rower.

Harald's reign saw him maintain close ties with the British royal family. He was a guest at numerous significant royal events, including the wedding of the Prince and Princess of Wales in 2011 and the Queen's Diamond Jubilee Lunch in 2012. Queen Elizabeth II made three state visits to Norway during his reign.

In recent years, King Harald had faced several health challenges. He was hospitalized in February for an infection and dehydration while in Tenerife and had a pacemaker fitted in 2021 after a similar health issue in Malaysia. Despite these health concerns, the King had repeatedly stated he would not abdicate, upholding his lifelong oath to the Norwegian Parliament.

His daughter-in-law, Crown Princess Mette-Marit, faced scrutiny over past ties to Jeffrey Epstein, a controversy King Harald publicly addressed, defending her by stating she had done nothing illegal and had broken contact with Epstein early.

Crown Prince Haakon is expected to succeed his father as king.