They are often patriotic songs that may have been in existence long before their designation as national anthem. The national anthem of the Netherlands, "Wilhelmus", officially adopted as national anthem in 1932, originates in the 16th century; it was written between 1568 and 1572 during the Dutch Revolt and its current melody variant was composed shortly before 1626, and was a popular orangist march during the 17th century. The Japanese national anthem, "Kimigayo" (adopted 1999), was composed in 1880, but its lyrics are taken from a Heian period (794–1185) poem.