William III St. Omer 
William III was born in 1120 in St. Omer, France. William III's father was William II St. Omer and his mother was Melesinde Picquigny. His paternal grandparents were William St. Omer and Aganitrude Brugge; his maternal grandfather was Arnoul Picquigny. He was an only child. He died at the age of 50 in 1170.
They had a son named William IV.
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Children
William IV St. Omer
William IV was born in 1150 in St. Omer, France. He died at the age of 42 in 1192 in Holy Land.
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