John de Cogan
John was born about 1169 in Bampton, Devonshire, England.  He died after 1195 in Cogan, Glamorganshire, Wales.

 Marie de Prendergast
Marie was born before 1180.  She died after 1195.

 Juliane de Cogan
Juliane was born in 1195 in England.  She died at the age of 62 in 1257.