The Lambtons of Lambton in county Durham, not far from the Northumberland border, were an ancient gentry family with a pedigree that could be traced back to the late twelfth century. Our MP’s father was an obscure figure who took little part in the public affairs of either the palatinate or Northumberland, and he himself began to take an independent local role before his father’s death. His early career is difficult to trace. The first mention of him dates from April 1420 when Robert Bellasyse granted his manor of Henknoll (county Durham) to the elder William Lambton and his three sons, Robert, William and Thomas.
Now head of the family, in December 1430 Lambton was elected as one of the knights of the shire for Northumberland, probably in the interest of the Percy earl, who was eager to ensure the payment of assignments made to him for the defence of the east march. His re-election for the county, together with the election of his son Robert for the Westmorland borough of Appleby, to the next Parliament, which met in May 1432, is to be explained in the same terms. Indeed, it was perhaps in connexion with the earl’s custody of the march that the day before the end of this latter Parliament Lambton was appointed as one of the collectors of customs and subsidies in the port of Newcastle-upon-Tyne. The customs promised a ready source for the earl’s assignments.
Lambton’s promising career was cut short by his untimely death on 4 Mar. 1434. A writ of diem clausit extremum was issued from the Durham chancery on 21 Mar. and the inquisition post mortem held three days later. The jurors found that, aside from the property listed in his father’s inquisition, he also held the manor of Tribley, near Lambton, which he appears to have acquired by purchase. His son and heir, Robert, was said to be aged 28 or more. William was buried in the church of the Carmelite Friars in London, indicating that he had probably died while on business at Westminster.
The execution of Lambton’s will was placed in the hands of his two eldest sons, Robert and Thomas (d.1473), and over the next few years they were engaged in occasional litigation at Westminster in pursuit of their father’s debtors.
