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Portrait of Cardinal Juan Everardo Nithard, by Alonso del Arco (c. 1674). Prado Museum (Madrid).

Juan Everardo Nithard SJ (German: Johann Eberhard Nithard) (Falkenstein (Upper Austria), 8 December 1607 – Rome, 1 February 1681) was an Austrian priest of the Society of Jesus, confessor of Mariana of Austria (Queen and Regent of Spain), cardinal, and valido (royal favorite) of Spain.