Matthew I De Louvaine
Matthew I was born about 1175 in Bedford, Bedfordshire, England.  He died before June 1258.

 UNKNOWN Murial
UNKNOWN was born about 1184 in Louvaine, France.  She died after 1275.

 Hawise De Louvaine
Hawise was born about 1200 in Little Easton, Essex, England.

 Matthew II De Louvaine
Matthew II was born about 1227.