Francis Bacon, 1969. Triptych portrait that sold for $142M in 2013 — then the world auction record for any artwork.
From Wikipedia
Three Studies of Lucian Freud is a 1969 oil-on-canvas triptych by the Irish-born British painter Francis Bacon, depicting artist Lucian Freud. It was sold in November 2013 for US$142.4 million, which at the time was the highest price attained at auction for a work of art when not factoring in inflation. That record was surpassed in May 2015 by "Version O" (1955) of Pablo Picasso's 1950s Les Femmes d'Alger series.