From "Treago and Mynors Family", 2nd edtion 1998, by H. Mynors, private publication:
Henry was succeeded by his three daughters and co-heiresses, ISABEL, ELIZABETH and BASILIA (Fine and Close Rolls: CPR: Testa de Nevill). They were already married, Isabel to GEOFFREY DE LONGCHAMP, Elizabeth to WILLIAM DE GAMAGES and Basilia to PAYN DE BURGHILL. They recur in different contexts arising from the division of their father's estate, notably the advowson of Westbury (Plea Rolls: CPR: Reg. Bishop Ludovic de Charlton). What happened to the Gloucestershire fiefs?
Foxcote was divided and the Master of the Templars sued the three daughters and their husbands, (the case being heard at Gloucester in 1221 (Curia Regis Roll): Selden Soc. vol 59). In the Feudal Aids of 1284-85 the Curzon family were holding Foxcote of the Templars.
At Culkerton, Isabel gave her land to St. Oswald's, Gloucester and they sold it in 1231 to St. Mary's, Kingswood (Kingswood). About 1239 Elizabeth released certain land there to Kingswood: and in the Feudal Aids of 1303, they were holding Culkerton of the Earl of Hereford.
The manor and advowson of Westbury on Severn were divided (Fine and Close Rolls: PQW). Isabel sold her share to Henry de Bathe. Elizabeth's share went to her son Matthew de Gamages, who passed it to his brother Nicholas. Basilia enfeoffed her younger son Henry de Burghill in her share of the manor but gave her share in the advowson to the Bishop of Hereford. Henry de Burghill died without issue in 1271 and was succeeded by his elder brother Roger (Fine Roll; Chanc. Inq.p.m.).
The same division occurred at Burghill. But Isabel de Longchamp sold her share to her nephew Roger de Burghill, while Elizabeth de Gamages and Basilia de Burghill retained theirs (Testa de Nevill). The descent of the one-third de Gamages share can be traced through the de Penbrugges to the Oldcastles, and so to the Hackluyts. The two-thirds de Burghill share descended through the Eylesfords to the Milbornes. The cadet line of the family which we trace in the next chapter will be found to be under-tenants in the de Gamages share of the manor. At his death in 1528 Richard Mynors of Treago was holding land in Burghill of John Hackluyt (Inq.p.m.).