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Researchers struggling to solve a longstanding Leonardo da Vinci mystery -- the fate of a lost masterpiece known as the "Battle of Anghiari -- have found intriguing traces of paint hidden behind a 5-inch-thick frescoed wall in Palazzo Vecchio, Florence's 14th-century city hall.
The color is consistent with that used by the Renaissance creator of the Mona Lisa, suggesting that Leonardo's artwork has remained hidden behind that frescoed wall for more than 500 years.
Known as the "Battle of Marciano," the mural was painted by the renowned 15th-century painter, architect and writer Giorgio Vasari (1511-1574) in the imposing Hall of the Five Hundred. The hall was a room built at the end of the 15th century to accommodate the meetings of the Florentine Council.