Dirk V, Count of Holland

Gertrude and her son withdrew to the islands of Frisia (Zeeland), leaving William to occupy the disputed lands.

Baldwin gave Dirk the Imperial Flanders as an appanage - including the islands of Frisia west of the Frisian Scheldt river.

The claim of Robert to the guardianship of his nephew Arnulf III was disputed by Richilde, Countess of Mons and Hainaut, the widow of Baldwin VI.

While Robert was thus engaged in Flanders, an effort was made to recover the County of Holland and other lands now held by William of Utrecht.

With the help of Robert (his stepfather) he raised an army and besieged Conrad of Utrecht, the successor of William, in the castle of Ysselmonde, taking him prisoner.