Following the admission in 1344 of Robert’s father, the son of Roger Thornes of Thornes near Lichfield, as a burgess of Shrewsbury, he and his descendants became leading members of the community. The elder Robert, who was one of the four townsmen summoned from Shrewsbury in 1356 to confer with the King in a council of merchants at Westminster, sat for the borough in the Parliaments of 1357, 1361 and 1365, and served as bailiff in 1363-4.
During his first bailiffship, Thornes travelled to London with his fellow, Hugh Wigan, to obtain a royal grant of murage, and also, probably in order to seek advice regarding the unrest still prevalent in Shrewsbury, visited Richard, earl of Arundel, at Much Wenlock. When a further ‘composition’ reforming the town government was agreed on 16 Aug. 1389 at Shrewsbury abbey in the earl’s presence, both Thornes and Wigan were confirmed in office.
But before very long Thornes was again caught up in borough affairs, and, in addition, for eight months in 1401 he was entrusted with the royal office of escheator in Shropshire. He appeared as an assessor at the Shrewsbury guild merchant meeting of January 1408. In July 1410, two months after the dissolution of the Parliament of that year (to which he had been returned while bailiff, and in association with his brother Roger), he was commissioned to make inquiries into the administration of the lordship of Caus, only to be replaced by his brother before 24 Oct. In August 1411 certain Shrewsbury butchers were indicted before the j.p.s for selling hides to, among others, Robert Thornes, at prices contrary to the statutory limitations, yet whether, like his father, he made a living primarily from trade, does not emerge.
The Thornes family acquired extensive property in Shrewsbury, and Robert himself is known to have held a grange by the castle, buildings in Baxter’s Row (now High Street), and a mansion in Castle Street (where he was living in 1402) which was to be later known as Thornes Place. Also in his possession were a moiety of the manor of Cantlop (purchased by his father in 1359), lands in Eaton Mascott, Berrington and Abbey Foregate, a meadow known as ‘Barnardesclose’, and a house named ‘Hardyngesplace’.
