General Notes

Agnes de St. John was born before 1277. She was the daughter of John de St. John and Alice FitzPiers.
She married Hugh de Courtenay, 1st Earl of Devon, son of Sir Hugh de Courtenay and Eleanor le Despencer, circa 1292.
She died on 11 June 1345.
Her married name became de Courtenay.

Children of Agnes de St. John and Hugh de Courtenay, 1st Earl of Devon
Hugh de Courtenay, 2nd Earl of Devon+ b. 12 Jul 1303, d. 2 May 1377
Margaret de Courtenay+ b. b 1322, d. 2 Aug 1385