Comte Engilbert de Brienne IV
Engilbert was born about 1020.  He died in 1055.

 Petronelle de Joigny
Petronelle was born about 1020 in France.  She died after June 5th, 1050.

 Comte Gauthier de Brienne I
Gauthier was born in Brienne-le-Chateau, Aube, Champagne, France.