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Male William De IV St. Omer Click to view William De IV St. Omer in the family tree

William De IV was born about 1150 in St. Olmer, France.  William De IV's father was William De III St. Omer and his mother is Matilda.  His paternal grandfather was William De II St. Omer and his paternal grandmother is Melisende De Picquigny.  He was an only child.  He died in 1192 in Holyland.


William De IV's family with Ida De Avesnes

‌William De IV and Ida were married in a religious ceremony in 1st husband.  They had a son named Nicholas De.

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