Gerulf, Count Of FRIESLAND 
He had two biological sons named Waltger, Count Of and Dirk I Count Of.
Family Notes
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Children
Waltger, Count Of NIFTERLAKE
Waltger, Count Of was born about 0898 in Of Noordwijk-Binnen, Z-Holl., Neth..
Dirk I Count Of HOLLAND
Dirk I Count Of was born about 0900 in Of, Noordwijk-Binnen, Zuid Holland, Netherlands. He died on October 6th, 0939. He was buried in Egmond-Binnen, Noord Holland, Netherlands.