1 - Atho, built a castle at Courtenay, Gatenois, France
- 2 - son
- 3 - Milo, elder son, Lord of Courtenay
- 4 - [unproven that he was Milo's son] - Reginald de Courtenay, d 27 Sep 1194
m1 - unknown
- 5 - William de Courtenay, elder son, d bef 1209
m Avis D'Aincourt, d 31 Jul 1209
- 6 - Robert, died at his Manor of Iwerne Courtenay, County Dorset, 26 Jul 1242, bur Ford
Abbey.
m Mary de Redvers, of Vernon; many years a widow; Abbess of Quarr, in the Isle of Wight;
Abbess of Pratelles, in Normandy
- 7 - John Courtenay, eldest son, succeeded to the Barony of Okehampton; d 1273, bur Ford
Abbey
m Isabella, dau of Hugh de Vere, Earl of Oxford
- 8 - Sir Hugh Courtenay, Knight, heir, b1250; bur Cowick, Feb 129I
m Eleanor, dau of Hugh De Spencer; she died in 1238
- 9 - Hugh de Courtenay, eldest son, b1275, succeeded to the Barony of Okehampton;
eventually made Earl of Devon, died in 1340
m Agnes, daughter of Lord St. John
- 10 - four sons and two daughters
- 10 - John , eldest son, Abbot of Tavistock from1334, died1349
- 10 - the second son Sir Hugh Courtenay, succeeded to the earldom; died 1377 married Margaret
de Bohun, dau of Humphry, Earl of Hereford, and granddau of King Edward I
- 11 - eldest son, Sir Hugh Courtenay, born 1327, died bef 1377
- 12 - Hugh - only son, died bef 1377 m Matilda Plantagenet
- 11 - William, became Archbishop of Canterbury.
- 11 - Sir Peter, was Constable of Windsor, grand standard bearer, and chamberlain; died 1405, bur
Exeter Cathedral
- 11 - sixth son, Sir Philip Courtenay, was seated at Powderham
- 11 - large family
- 11 - Edward Courtenay, of Godlington, died bef 1377
- 12 - Edward Courtenay, b 1357, became Earl 1377; known as the "blind earl," d 1419
- 13 - Edward, knighted 1399, d bef 1419
m Eleanor, second dau of Roger Mortimer, died childless
- 13 - Hugh, b 1389, succeeded to the earldom 5 Dec1419
m a daughter of the Lord Talbot
- 14 - Thomas, Earl of Devon, died at the Abbey of Abingdon, believed of poison, 3 Feb I458
m 1422 Margaret Beaufort
- 15 - Thomas, eldest son, earl for three years; prisoner at Towton, attainted, executed
- 15 - Henry, beheaded at Salisbury 4 Mar1466.
- 15 - John, youngest son, regained the earldom, but died at Tewkesbury 14 May 1471
#12 Edw m2 Matilda, daughter of Thomas Lord Camoys; she died in 1467
- 12 - Sir Hugh Courtenay, of Haccombe and Boconnoc
- 13 - ?
- 14 - Edward - created Earl of Devon by patent 26 Oct 1485
- m his cousin, Elizabeth, dau of Sir Philip Courtenay of Molland
- 15 - Sir William Courtenay, Knight of the Bath, d spring 1511 at Greenwich
m Katherine Plantagenet, dau of King Edward IV, youngest sister of Elizabeth, King Henry's queen.
- 16 - Henry, made Marquessate of Exeter 18 Jun 1525; beheaded 9 Jun I539
- 17 - Edward Courtenay, b 1527, Earl of Devon 1553, d Padua 4 Oct 1556
- 16 - Margaret, b c 1498; died before her husband,
m Henry, Lord Herbert, eldest son of Chas Somerset, Earl of Worcester
- 13 - Elizabeth first dau m John Tretherffe - their GRANDSON Tho had
- 1 - dau Eliz who m John Vivian & had son John Vivian
- 2 - Margaret, m1 Edward Courtenay, of Wotton, m2 Richard Buller of Tregarrick
- 13 - Isabell m Wm Mohun of Hall
- 13 - Maud m Sir John Arundell
- 13 - Florence m John Trelawny 1468
- 7 - son
- 7 - Avis
m John Neville
- 6 - William
- 6 - Reginald
- 5 - Robert de Courtenay, younger son, d 1209 or before
m Alice de Romele, dau of the north country lord of Skipton, Sheriff of Cumberland
(4) Reginald de Courtenay came to England in 1152 and
m2 - Matilda, younger dau of Maud, Baroness of Oakhampton
- 3 - Josceline, younger son, Count of Edessa