William III (Guillaume) of PONTHIEU, Count of Ponthieu 
William III (Guillaume) of was born in 1179 in Ponthieu, France. He died at the age of 42 on October 6th, 1221 in France.
They had a daughter named Marie (Jeanne) .
-
Children
Marie (Jeanne) PONTHIEU, Count of Ponthieu
Marie (Jeanne) was born on April 17th, 1199. She died at the age of 51 in September 1250.