The Battle of Cassel was fought on 22 February 1071 between Robert the Frisian, Count of Flanders and his nephew, Arnulf III. Arnulf succeeded his father Baldwin VI, Count of Flanders in 1070 and was supported by his mother Richilde, Countess of Mons and Hainaut. However, Robert challenged Arnulf's succession to the throne of Flanders and began rallying support mainly in northern Flanders (where the bulk of Arnulf's forces were located). Arnulf's ranks contained individuals such as Eustace II, Count of Boulogne and his sons Eustace III, and Godfrey of Bouillon. Moreover, Arnulf was supported by King Philip I of France since Philip's aunt, Adela, married Baldwin V of Flanders. A contingent of ten Norman knights led by William FitzOsborn were among the forces sent by Philip to aid Arnulf. Robert's forces attacked Arnulf's numerically superior army before it could organize. Arnulf himself was killed along with William FitzOsborn while Richilde was captured by Robert's forces. However, Robert himself was captured by Eustace II. Ultimately, Richilde was exchanged for Robert's freedom.
|Father||Mother||Death date||Age at death|
|Arnulf of Flanders (?-1071)||Baldwin VI of Flanders (c1030-1070)||Richilde von Egisheim (c1020-1086)||1071|
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