Sackville’s father, who represented Sussex in the Parliaments of 1361, 1368 and 1369, was not only an important landowner in this county, where he held eight manors besides Buckhurst, but also owned Emmington in Oxfordshire, Mount Bures and Bergholt in Essex, and Debenham in Suffolk. All these properties were eventually to pass into the possession of our MP, despite his having being born a bastard, for both of his legitimate half-brothers—Sir Andrew the younger (c.1340-1366) and John—died in their father’s lifetime, leaving no issue of their own. As certain of the manors had come to the Sackvilles through marriage with Joan de la Beche, mother of the younger Sir Andrew, Sir Thomas, when defending his interests in lawsuits brought by the de la Beche heirs in Henry IV’s reign, was to claim to be that Sir Andrew’s son in order to strengthen an otherwise weak title.
Sir Thomas could expect to receive a substantial income from his patrimony. In 1412 his estates in Essex and Sussex alone were to be assessed as worth £75 a year, and this was probably an undervaluation.
Yet Sackville was clearly well regarded by members of the gentry of Sussex and the neighbouring counties. Sir William Burcester made him a trustee of his lands and bequeathed to him a ‘swagged cuppe’; the wealthy Sir Philip St. Cler asked him to assist in his purchase of ‘Quene Court’ in Ospringe; and Sir Reynold Cobham, heir to Lord Cobham of Sterborough, enfeoffed him of his widespread estates. More important, in May 1415, he was among those whom Thomas, earl of Arundel, entrusted to put into effect an entail of his lordships in Sussex and Surrey. In the following year Nicholas Carew, a fellow feoffee of the Fitzalan estates, included him as party to a settlement of his own lands; and then, in 1417, Richard Wayville, a retainer of the late earl, named him as overseer of his will.
Sackville’s elder son, Andrew, had died in 1408, leaving as his heir an infant son of the same name. In the 1420s Sir Thomas made various settlements providing that, after his death, his Essex manors should pass to this grandson and the rest of his lands to his surviving son, Edward. Before they inherited, however, the large sum of £366 13s.4d. was to be raised from the revenues of the estates in order to cover the testamentary depositions contained in the will the old man made on 19 May 1432. These included the maintenance and relief of poor orphans, widows and other needy persons (in particular any of his tenants who were impoverished, aged, bedridden or sick), repairs to roads, the deliverance of persons imprisoned for debt or trespass (but, expressly, not for felony) and the celebration of masses for his soul and those of his deceased parents and wife. In his final will, made on 1 Dec. following, Sir Thomas left 100 marks to Bayham abbey where he was to be interred. Three days before probate was granted (on the 16th) his two heirs were each bound in £2,000 to carry out his wishes.
