I Dietrich 
I was born about 0903 in Noordwijk-Binnen, Zuid, Holland.1 I's father was II Gerulf. His paternal grandfather is of Holland Gerulf. He was an only child. He died on October 6th, 0939.2 
They had a son named Count of West Friesland.
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Children
Count of West Friesland Dietrich II
Count of West Friesland was born in 0938 in Egmond-Binnen, Netherlands.2 He died at the age of 50 on June 5th, 0988.1
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