His father, Francis Hoblyn, born in 1687, a J.P. for Cornwall and a member of the Stannary parliament, was buried at St Columb on 9 November 1711.
He sat as one of the members for the city of Bristol from 24 November 1742 to 8 April 1754, and was appointed speaker of two convocations of the Stannary parliament in Cornwall.
He inherited a fortune, increased by the returns from the Herland copper mine in Gwinear parish, west Cornwall.
[2] With his wealth he restored his ancestral home, Nanswhyden House, employing Potter as the architect.
The estates under the entail went to the issue male of Thomas Hoblyn of Tresaddern, while the library went to Quicke.
[1] In 1768 Quicke printed the library catalogue in two volumes, as Bibliotheca Hobliniana sive Catalogus Librorum juxta exemplar quod manu sua maxima ex parte descriptum reliquit Robertus Hoblyn, Armiger de Nanswhyden in Comitatu Cornubiæ.
Nanswhyden House was destroyed by fire on 30 November 1803, with its collections of ancient documents, the records relating to the Stannary parliament, and a cabinet of minerals.