What medium is "Allegory of the Stadtholdership of Prince Frederick Henry"?

Allegory of the Stadtholdership of Prince Frederick Henry is oil on panel.

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Allegory of the Stadtholdership of Prince Frederick Henry

Allegory of the Stadtholdership of Prince Frederick Henry was created by Adriaen Pietersz van de Venne in 1642.

Adriaen Pietersz van de Venne, 1642