Count Dirk III defeats an army sent by Emperor Henry II in the Battle of Vlaardingen.
Dirk III (also called Dirik or Theodoric) was the count with jurisdiction over what would become the county of Holland, often referred to in this period as "West Frisia", from 993 to 27 May 1039. Until 1005, this was under regency of his mother. It is thought that Dirk III went on pilgrimage to the Holy Land around 1030, hence his nickname of Hierosolymita ("the Jerusalemite" in Latin).