With Conrad I being childless, the throne was open to Arnulf, again.
II: The Popes During the Carolingian Empire, 795–858" (1906)* DeCormenin, Louis Marie; Gihon, James L., "A Complete History of the Popes of Rome, from Saint Peter, the First Bishop to Pius the Ninth" (1857)== Zunanje povezave ==*Biografia di papa Valentino*History of the Popes, The lives of the Popes in the ninth century: Valentine, A.D. 827.