William de Tregoz
William was born about 1100 in Billingford, Norfolk, England.  He died after 1131.

 Agnes de Lucy
Agnes was born about 1112 in Billingford, Norfolk, England.  She died after 1198.

 Robert de Tregoz
Robert was born about 1168 in Salisbury, Wiltshire, England.  He died about 1215 in Ewyas-Harold, Hereford, England.