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Baldassare Castiglione was born in 1478. He was an Italian diplomat, courtier, and writer best known for his book "The Book of the Courtier," a treatise on the ideal Renaissance courtier. Castiglione was born into a noble family in Casatico, near Mantua, Italy. He received a humanist education and served as a diplomat for various Italian courts. He was also a close friend of the artist Raphael.