Jean V D' Harcourt
Jean V D' was born about 1315.  He died  due to Executed. on April 5th, 1355.

 Blanche De Ponthieu
Blanche De was born about 1321.  She died on May 12th, 1387.

 Jean VI D' Harcourt
Jean VI D' was born on December 1st, 1342.  He died at the age of 47 on February 28th, 1390.

 Jacques I D' Harcourt
Jacques I D' was born about 1343.  He died on April 22nd, 1405.