He was the son and heir of John de Cobham (d. 1300),[2] of Cobham and of Cooling, Sheriff of Kent, Constable of Rochester Castle in Kent and one of the Barons of the Exchequer,[2] by his wife Joan de Septvans (d. 1298),[3] whose monumental brass survives in Cobham Church, a daughter and co-heiress of Sir Robert de Septvans[2] of Chartham[4] in Kent.
His uncle was Sir Henry de Cobham (d. c. 1316), of Rundale, Kent, Lord Warden of the Cinque Ports, who by his wife Joan Pencester (bef.
Ki ke pur le alme priera, Quaraunte jours de pardoun auera.
It has, perhaps, a larger number and a more representative collection than any other county, although individually finer examples may be found elsewhere.
[2] He was Lord Warden of the Cinque Ports in 1307 and between 1315 and 1320 and he served thrice as Sheriff of Kent (1300–1301, 1307 and 1315).