King Haakon VII was already married, before he came to Norway (in 1905). His wife, Princess Maud, became Queen Maud. Their son, Prince Alexander of Denmark, became Crown Prince Olav and followed after his father as King Olav V in 1957. Olav and his wife, Crown Princess Märtha, had three children; Princess Ragnhild, Princess Astrid and Prince Harald (later Crown Prince Harald and in 1991 he followed his father as King Harald V).