More may be added to the earlier biography.
The Tudor antiquary, John Leland, was mistaken in his statement that the Merburys were lords of the Herefordshire castle of Lyonshall. Although John Merbury was recorded as holding a knight’s fee there in 1428 and 1431, his interest was not hereditary.
As a young man, Merbury’s military experience may have been more extensive than suggested in the earlier biography. He is probably to be identified with the man who sued out a protection in December 1391 for service under Henry Percy, earl of Northumberland, on the Scottish borders, and who in October 1401 did the same in respect of service in Aquitaine under Edward, earl of Rutland.
An agreement of 1429 confirms the impression created by his will that Merbury was, or at least became in the later part of his successful career, a man of considerable means. On 18 Aug. 1429 James, Lord Berkeley, was bound to him for the payment of 900 marks, and on the 22nd Berkeley conveyed the manors of Portbury (Somerset) and Alkington (Gloucestershire) to four of our MP’s associates, Richard de la Mare*, John Brugge†, Edmund Morris† and Thomas Lightfoot, as surety for payment. Three days later, our MP, his wife and others demised to Berkeley in fee the Welsh manor of Talgarth, which they held by the grant made in 1420 by Berkeley’s mother, Elizabeth Bluet, and her fourth husband, William ap Thomas. The probability is that Talgarth was the original security for the repayment of a loan made by Merbury to Berkeley when the latter needed funds to pursue his famous dispute with Richard Beauchamp, earl of Warwick, over the inheritance of his uncle, Thomas, Lord Berkeley (d.1417). An award of 1425 had brought a temporary end to this quarrel, assigning to Berkeley, inter alia, the reversion of the manor of Portbury expectant on the earl’s death. The arrangement of 1429 thus marked a reworking of the security for the repayment of the loan.
Merbury’s wealth is also reflected in loans to the Crown. In June 1430 he received an assignment in repayment of £93 6s. 8d. lent a year earlier, and on 21 Apr. 1433 he did likewise in repayment of £66 lent on the previous day.
Both of Merbury’s wives made a significant contribution to his wealth, bringing him the landed estate that did not come to him through birth. Much of what is known of his private affairs concerns their lands. With his first wife he acquired a family, and he may have been instrumental in contracting her son, Richard Oldcastle, in marriage to Elizabeth, widow of Richard Ruyhale† of Birtsmorton (Worcestershire). His influence may also explain Oldcastle’s appointment as constable of Aberystwyth castle in 1411.
