Erard de Brienne
Erard was born in 1130.  He died at the age of 61 on February 8th, 1191.

 Agnes de Montfaucon
Agnes was born in 1135.

 John/Jean de Brienne
John/Jean was born in 1168 in France.  He died at the age of 69 on March 21st, 1237 in Constaninople, Turkey.