In 1155 the Frisians revolted again .
In 1155 the Frisians plundered the area of Santpoort nearby Haarlem , but they were beaten back by the knights of Haarlem and Osdorp .
In 1155 the Frisians revolted again and plundered the area of Santpoort nearby Haarlem , but they were beaten back by the knights of Haarlem and Osdorp .