Here are the most valuable paintings by each old master, along with the highest sale price achieved at auction:

Leonardo da Vinci - Salvator Mundi: $450.3 million (sold in 2017)
Michelangelo - no paintings survive, he was primarily a sculptor
Raphael - Portrait of a Young Man: $47.9 million (sold in 2002)
Titian - Diana and Actaeon: $76 million (sold in 2009)
Caravaggio - Judith Beheading Holofernes: $101 million (estimated value, not yet sold at auction)
Rembrandt - Interchange: $33.2 million (sold in 2015)
Vermeer - Interiors: $45 million (sold in 1999)
Rubens - Massacre of the Innocents: $76.7 million (sold in 2002)
Velázquez - Portrait of Juan de Pareja: $19 million (sold in 1971)
El Greco - Opening of the Fifth Seal: $31.9 million (sold in 1995)

Let me know if you would like more details on any of these paintings or artists. I can also suggest additional resources for researching the financial value of old master artworks if needed.
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