Svend, Knud og Valdemar is a play written by Peter Fristrup in 1887 and since then performed countless times, often in revised versions. The full title of the farce is "Svend, Knud og Valdemar" or "The Murder of the King in Roskilde" or "The Battle of Grathe Hede", a historical, romantic piece in five changes with inserted songs.
