"Dirk II or Theoderic II (920/930 – 6 May 988) was a count in West Frisia, and a predecessor of the counts of Holland. He was the son of Dirk I, count in West Frisia, and Geva (or Gerberge)." - (en.wikipedia.org 10.04.2021)
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(The left column lists the relations of this actor to objects in the right column. In the middle you find other actors in relation to the same objects.)
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