Magazine  (1888)  Page(s) 14.  
 
An evident rose enthusiast, in the Quarterly Review, compares the modern history of the queen of flowers to the English queen's reign with which it is contemporary. He says that not one of the 500 roses on the first list sent out by Mr. Rivers, of Strawbridgeworth, is now to be found at our rose shows. "What a dethronement of those kings and queens," says he: "Roi de Prusse, Reine de Belgique, King of Rome, Empress of Russia, Grand Sultan, and even Queen of Perpetuals herself, exist no more."

Book  (1846)  Page(s) 26.  
 
Once-blooming, hardy Roses. Hybrid chinas...Roi de Prusse, very beautiful, good fragrance. Purple-red shaded with violet, often also with ash-colour, 2 in wide, double, ranunculus-form. She is similar to the hybrid Ducis.

Magazine  (1834)  Page(s) 279.  
 
Hybrid roses....Roi de Prusse, Purple

Website/Catalog  (1826)  Page(s) 67.  
 
ROSA sinensis.
le roi de Prusse.

Book  (1826)  Page(s) 523.  
 
Rosier du Bengale... le roi de Prusse...Les variétés ne fleurissent qu'une fois. La plus grande partie est hybride de l'indica, du semperflorens, et du sinensis.