What food item is the Kipferl a descendant of ?
The " birth " of the croissant itself – that is , its adaptation from the plainer form of Kipferl , before the invention of Viennoiserie – can be dated with some precision to at latest 1839 ( some say 1838 ) , when an Austrian artillery officer , August Zang , founded a Viennese bakery ( " Boulangerie Viennoise " ) at 92 , rue de Richelieu in Paris .