User:Mitglied5

(Wikipedia member and author since 19 July 2013)

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The three colour portraits of Isabella d'Este in the Kunsthistorisches Museum Vienna - perhaps including mix-up?

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Ambras Miniature — anonymous Mantuan artist (16th century)
Isabella in Red — Rubens (c. 1605) after Titian (c. 1524-36)
Isabella in Black (assumed as youthful idealisation after Francesco Francia in 1511) — Titian (1530s)

Note: After Isabella's death portraits with capigliara were marketed as the famous 'prima donna del mondo'. Isabella in Black is identified by an inscription on a Dutch etching three generations later. There is neither idealisation nor similarity, so this identification is doubtful and the variance might block missing identifications.