The Carmen de bello Saxonico (German: Lied vom Sachsenkrieg; English: Song of the Saxon War) is an epic retelling in 757 hexameters in three books of the first phase of the Saxon Rebellion against the Emperor Henry IV, from its inception until the Battle of Spier in October 1075. It is also limited geographically to the Harz region. It is strongly imperialist in tone, and complements the pro-Saxon histories of Bruno the Saxon and Lambert of Hersfeld. It was first written within months of the events it describes. The only existing manuscript dates from the sixteenth century. It received its first critical edition from Georg Heinrich Pertz in 1851.