author
Best known for a vivid 19th-century travel book on Istria, Dalmatia, and Montenegro, this writer remains a mystery behind a set of initials. The surviving record points more clearly to the journey and the book than to the person.

by R. H. R.
Very little reliable biographical information seems to survive under the name R. H. R. The clearest verified detail is authorship of Rambles in Istria, Dalmatia and Montenegro, a travel book first published in 1875.
That book presents observations on the Adriatic regions of Istria, Dalmatia, and Montenegro, and it has remained discoverable through later library and digital editions. Modern catalog and bookseller pages also connect the initials R. H. R. with this title, but they offer little trustworthy personal background beyond the work itself.
Because the author's full identity is not clearly confirmed in the sources I found, it is safer to treat R. H. R. as an obscure or unidentified author known mainly through this single surviving travel narrative.