High Quality Content by WIKIPEDIA articles! Harald Henrik Sager Kidde (14 August 1878 in Vejle – 23 November 1918 in Copenhagen) was a Danish writer and brother to the politician Aage Kidde. He is best known for the novel Helten (The Hero), which is one of the key novels in Danish literaturev . Kidde died of Spanish Flu in 1918. Only 40 years old. There is an extensive Kidde-archive at Vejle Town Archive.