Book  (1842)  Page(s) 275.  
 
R. gallica....Varieties....with velvety blooms, whose dark colour has a velvety sheen in sunlight (R. gall. holosericea)....gloriosa superba

Book  (1838)  Page(s) 103.  
 
Gallica. Velvety. Gloriosa superba alias Geheimer Rath von Reider. Very magnificent, fragrant. Black purple-red, shaded violet-ash, velvety, 2 1/3 in., very full, domed form.

Magazine  (1829)  Page(s) 275.  Includes photo(s).
 
Rosa gallica. Geheime Rath von Reider. This yet rare, magnificent rose belongs to the darkest, fullest which have been obtained upto now. The blooms are medium size, blackish purple-brown, with some ash-coloured surrounding and beautiful double form, The foliage is perfect and is like that of other gallica roses. The shrub is 3-4 foot high in the garden. Real suckers cost 2 1/2 Gulden per piece.

Book  (1828)  Page(s) 145.  
 
The author has imported from every country those which are there considered the darkest or blackest, which have all produced flowers, he is consequently able to give his opinions with accuracy. ...next are the Imperial, the Sable, the Black Mogul, and the Gloriosa Superba Noir...