The Piccolomini Library is inside the monumental setting of the cathedral of Siena . Located in the left nave, before the transept, it was built in 1492 by the Archbishop of Siena, Cardinal Francesco Piccolomini Todeschini (then Pope Pius III ) to preserve the rich library of books collected by his uncle Pope Pius II .
Between 1502 and 1507 it was completely frescoed by Pinturicchio with the aid of several painters including the Bolognese Amico Aspertini and the young Raffaello Sanzio. - Wikipedia
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