Routh did not excel in modern languages but was an excellent classical scholar. In 1784 was published his edition of the
Euthydemus and
Gorgias of
Plato but as time went on his interests turned towards
patristics, which he would devote the rest of his life to studying. He was especially interested in the minor ecclesiastics of the second and third centuries, the ante-Nicene fathers. In 1814 he published two volumes of
Sacrae reliquiae; in 1818 the third and fourth volumes appeared; in 1848 appeared the fifth volume.
Samuel Parr said on 26 March 1814: I have most carefully perused the two volumes of the
Sacrae reliquiae. No such work has appeared in English for a century. I wish
Joe Scaliger,
Bishop Pearson,
Richard Bentley,
Bishop Bull,
Bishop Stillingfleet, and Doctors
Grabe and
Whitby were living to read what I have been reading...Martin Routh is of the right stamp, orthodox but not intolerant, profound, not obscure, wary, not sceptical, very, very, very learned, not pedantic at all. In 1852, aged 97, Routh published the portion of Burnet's
History that covered the reign of
James II (1685–1689), adding material not included in the previous edition. He presented a copy to the Chancellor of Oxford, the
Duke of Wellington. Routh's nephew, who helped him with the book, enquired of him: "Why is it, uncle, that you are always working at Burnet, whom you are always attacking?" Routh replied: "A good question, sir. Because I know the man to be a liar; and am determined to prove him so". ==Later life==