Count Immo IV of Loos
Immo was born in 1017.  He died at the age of 60 on January 17th, 1077.

 Irmengarde von Hornes
Irmengarde was born in 1030.

 Count Arnulf I of Loos
Arnulf was born in 1057.  He died at the age of 78 in 1135.