The Things I Wouldn't Have Known If I hadn't Googled Them

That's a picture from, or from about the same time as, the original production (1865) of Tristan und Isolde, with husband and wife Ludwig and Malwine (correctly, Malvina--She was of Portuguese descent) Schnorr von Carolsfeld in the title rôles.  Six weeks after  the première, Herr Schnorr von Carolsfeld (Ludwig) up and died--poisoned, I believe, by Frau Schnorr von Carolsfeld (Malvina) "who therewith sank into a deep depression," and never afterward sang a note, of Tristan or of anything else; although she did, I conjecture, give Wagner (with whom she was passionately, secretly in love--although I don't think she liked his music, because singing it made her hoarse) to understand that she'd be back in full voice the instant he ditched Cosima (of whom she was madly and outspokenly jealous).  I am not making this up, except for the part about Frau Schnorr von Carolsfeld poisoning Herr Schnorr von Carolsfeld.  While he lived, Wagner never heard another performance of this, arguably, his single greatest work, though he soon died in Venice where he wrote it. Or, I should say probably, where he finished writing the second act.  He wrote the third act in Lucerne.

"Malvina Garrigues Schnorr von Carolsfeld died in Karlsruhe in 1904, aged 78, was cremated in Heidelberg, and her ashes are located in Dresden."  Along with a lot of other ashes.