Nathaniel Briant was an architect from Reading active in the early- to mid-19th century. He worked in partnership with architect, Henry Briant (born 1813, died 1884), also of Reading. The latter is noted to have left architecture for the Church and to have been ordained in 1843.
Bibliography
Colvin, Howard, A Biographical Dictionary of British Architects 1600-1840, 3rd edition (New Haven and London: Yale University Press, 1995), p. 160.