The generally worthwhile and well-sourced (fallible, like others...) data.bnf.fr (a service of the French National Library)

edit

gives 29, not 20, July 1857 for his birthdate: see http://data.bnf.fr/13178151/paul_viardot/ . Schissel | Sound the Note! 11:39, 22 August 2017 (UTC) (also: gives Paul-Louis-Joachim Viardot for his full name.) - Eric 11:40 UTC)Reply