Alain I De Penthievre
Alain I De was born about 1154.  He died on December 29th, 1212.

 Petronille De Beaumont-au-Maine
Petronille De was born about 1175.

 Henri II De Penthievre
Henri II De was born on June 16th, 1205.  He died at the age of 76 on December 6th, 1281 in Cordeliers de Dinan.