Sven Aggesen
Svend Aggesen (or "Sven"; also known as Aggessøn, Aggesøn or Aagesen, in Latin Sveno Aggonis; born around 1140 to 1150, death unknown) is most famous, in Denmark at least, as the author of one of the first attempts to write a coherent history of Denmark covering the period 300AD-1185AD. Only the Chronicon Roskildense may precede Aggesen's efforts.
Read more about Sven Aggesen: Family, Life and Education, Relationship Between Svend Aagesen and Saxo Grammaticus