William was the eldest legitimate son of Sir John Bertram, who had a long career in the affairs of Northumberland and county Durham.
Later, like many of his fellow Northumberland gentry, Bertram gravitated towards the service of Henry Percy, earl of Northumberland, who on 6 Nov. 1440 retained him with an annual fee of as much as 20 marks. Further grants made by the earl during the 1440s reveals him to have been one of the earl’s leading servants in Northumberland: between September 1441 and April 1448 he received leases for life of the demesne lands of the Percy manors of Prudhoe, Harlow and Birtley.
During the course of this Parliament Bertram’s career was further advanced. On 22 Dec., five days after the end of the first session, he secured appointment as collector of customs in Newcastle, probably to ensure payment of assignments made on the customs in favour of the earl’s eldest son, Lord Poynings, for the defence of the east march; and on 24 Apr. 1450, five days before the Parliament assembled for its last session, his elderly father died and he finally became lord of Bothal. Matters arising from his father’s death may have prompted him to seek election to the next Parliament. On 1 Oct 1450, at an election at which he was again present, he was returned with his cousin, John Ogle. On the following 24 Mar., towards the end of the second session, the two MPs acted together, with Bertram offering surety when the Crown committed to Ogle a valuable fishery in the river Tweed.
In the 1450s Bertram continued to serve the Percys, although this did not prevent him falling into dispute with another important member of the retinue, namely Thomas Ilderton, constable of Alnwick castle. The cause of the quarrel is unknown, but it was serious enough to prompt royal intervention. At some point before May 1455 the King wrote to the Percy earl urging him to move swiftly to arbitrate in the matter ‘for thease and welfare especially’ of ‘oure welbeloved Thomas Ilderton’, suggesting perhaps that it was Ilderton who had sought royal intercession.
The writ of diem clausit extremum for Sir William was not issued to the escheator of Northumberland until 13 Mar. 1465. The delay may have resulted from the confused and dangerous state of Northumberland during the early 1460s. The writ was issued only after John Neville, Lord Montagu, had been granted the earldom of Northumberland and custody of the Percy estates in August 1464, and may represent a return to the normal course of royal administration in the far north. In the inquisition held at Alnwick, Bertram was recorded as having dying seised of the manor of Bothal (except those lands held in dower by his stepmother), the manor of Whitworth, a moiety of the manor of Benwell, and further property in Benwell and Capheaton held of the Percy lordship of Prudhoe. His heir was named as his eldest son, William, then aged 16. The Crown soon acted on these findings. On 14 July the keeping of the Bertram lands was committed to two northern lawyers in royal service, Thomas Colt* and Henry Sotehill, to hold during the heir’s minority at a farm to be agreed with the treasurer. This exercise of royal patronage, however, did not meet with the approval of our MP’s cousin, Sir Robert Ogle II, now Lord Ogle, who entered the castle and manor of Bothal on 2 Aug. This proved the prelude for the return of the castle to the main line of the Ogles, for, at an uncertain date, our MP’s grandson and heir, Robert, died young and childless.
Bertram’s wife, Elizabeth, survived him and by Hilary term 1466 she had married the prominent Newcastle merchant, Alan Bird*.
