William De Tregoz
William was born about 1120 in Billingford, Norfolk, England.  William is no longer alive.

 Agnes
Agnes was born about 1143.  Agnes is no longer alive.

 John de Tregoz
John was born about 1167.

 Robert I de Tregoz
Robert I was born about 1168 in Salisbury, Wiltshire, England.  He died on April 29th, 1215 in Ewyas, Herefordshire, England.