This author of Prince Otto and St. Ives created a novel in which Ephraim Mackellar is the steward of the Durrisdeer estate and James Durie is the title character, and one in which Ransome and Captain Hoseason abduct Ebenezer Balfour's nephew David.  
He wrote the lines, "Say not of me that weakly I declined the labours of my sires" in one poem, while another poem by this author claims, "I am a kind of farthing dip, unfriendly to the nose and eyes".  In addition to those poems from his collection Underwoods, this author wrote a novel whose title character "plays Haroun-al-Raschid" in its second chapter, and eventually visits the Prince of Grunewald, and also wrote a novel about the Napoleonic soldier Capitaine Jacques St. Ives.  This author of Prince Otto and St. Ives created a novel in which Ephraim Mackellar is the steward of the Durrisdeer estate and James Durie is the title character, and one in which Ransome and Captain Hoseason abduct Ebenezer Balfour's nephew David.  For 10 points—name this author of The Master of Ballantrae and Kidnapped!, who also wrote about Billy Bones, Jim Hawkins, and Long John Silver in his novel Treasure Island.
He wrote the lines, "Say not of me that weakly I declined the labours of my sires" in one poem, while another poem by this author claims, "I am a kind of farthing dip, unfriendly to the nose and eyes".  
Robert Louis {Stevenson}