The Lematon brothers took their name from the small border settlement of Lemington in the parish of Edlingham in Northumberland, where their ancestors held land in the thirteenth and fourteenth centuries.
The early parts of Lematon’s professional career were focused in the north. He is first heard of in July 1426 when he acted as a mainpernor for John Horsley, granted an Exchequer lease of land in Northumberland.
In the spring of 1440 Mowbray relinquished the wardenship of the east march, and on 1 Apr. Sir Henry Percy was appointed to the office which his father, the earl of Northumberland, had held until the mid 1430s.
Perhaps by virtue of his duties in the duke of Norfolk’s service, Lematon began to acquire property in London and its hinterland, giving him easy access to the seat of the royal administration at Westminster. In the summer of 1432 he bought 11 tenements in the London parish of St. Giles without Cripplegate from the skinner Thomas Pomfret;
In the interim, and probably through his early ties to the Percys, Lematon had begun to forge important connexions at court, where William de la Pole, earl, marquess and eventually duke of Suffolk, was growing in influence. The first tangible reward of this association was the grant to Lematon in 1445 of the parkership of Liskeard, an office pertaining to the King’s duchy of Cornwall,
During much of the second half of the 1440s Lematon used the favour in which he was held by the ruling clique to acquire a string of official appointments. In May 1447 he was granted the office of warden of the exchange, mint and coinage, which had previously been held by the King’s physician, Master John Somerset*, and which brought with it wages of as much as 2s. 6d. a day. In addition, he was also assigned the reversion of the even more lucrative office of chancellor of the Exchequer, which Somerset in the first place continued to occupy.
Lematon’s loss of the reversion of the chancellorship of the Exchequer represented at most a minor setback, and did not affect his relations with Suffolk, with whom in January 1449 he shared the exclusive privilege of mining gold, silver, lead and copper throughout the realm, except for Devon and Cornwall, for 50 years, paying a royalty of a fifteenth of gross output.
By the second half of the 1440s Lematon was evidently spending at least part of his time around the court and capital in the south-east. In early 1447 he attested the Middlesex shire elections, and (while the backing of the court clearly played a part) became sufficiently established among the gentry of that county to secure election to the Parliament summoned to meet in February 1449. Beyond doubt, he played his part in securing the insertion into the wool subsidy bill of a clause safeguarding the sum of £400 p.a. assigned to him for the repair and maintenance of the Northumbrian castles.
