"I dreamt I dwelt in marble halls" is from M. W. Balfe (music) & Alfred Bunn's (lyrics) opera of 'The Bohemian Girl', 1843.
"Tis the last rose of summer", is Thomas Moore's song to a tune he called "The Groves of Blarney", 'Sel'n of Irish Melodies', #5, 1813, an altered version of "Castle Hyde" (in my Irish tune index).
For a tune not noted by Fiske, noted above, see "Pretty Peggy of Derby, O" on my website. There's even a traditional version (U. of Virginia, Alderman Lib., unpublished) of Colman's "Brandy, O/ Landlady of France"