Thomas was the eldest son and heir of Simon Weltden, a member of a long-established Northumberland landowning family who had sat for the borough of Newcastle-upon-Tyne in 1426. The first reference to Thomas dates from 4 Jan. 1424 when his father contracted him in marriage to Margaret, daughter of the Lancashire lawyer, William Gernet. The match was almost certainly brokered by Thomas’s putative uncle, Richard Weltden, a prominent lawyer with connexions to the Neville family, who had probably come to know Gernet through their mutual interests at Westminster. The portion of only £40 was quite modest, but the marriage was a good one and brought Thomas an immediate interest in the family’s manor of Thornbrough.
Thomas must have been a young man at this date and it was not until 1450 that he inherited the family estates. Yet, even though he only had the modest property settled upon him on his marriage, he took a significant part in local affairs in the 1440s, serving as escheator in 1443-4 and, more surprisingly, as sheriff in 1446-7. Then, immediately after his father’s death, he both succeeded him as customs controller in Newcastle and was again named as escheator.
Yet Weltden’s probable connexion with the Nevilles did not lead him to take a prominent part in public affairs in the new reign. Although he was once more appointed controller of customs in the port of Newcastle in May 1461, he did not receive any other offices or appointments, and very little is recorded of his activities more generally. The most interesting reference to him dates from Hilary term 1466 when, with more than 40 lesser men, he was sued in the court of common pleas by Ralph, Lord Greystoke, for depasturing his grass at Newbiggin-on-the-Moor (in Newburn), about half way between Welton and Newcastle.
