Mick Jagger's secret love letters to Marsha Hunt,
the black US singer who inspired the Rolling Stones' hit Brown Sugar,
sold for 187,250 pounds (301,472 dollars) at Sotheby's in London
The auction house said the 10 letters, penned by Jagger in the summer of 1969, were sold to a private bidder, fetching more than double the pre-sale estimate.
"Beguilingly lyrical and displaying a wide range of cultural interests," the letters shed a "fascinating new light on the rock legend," said Sotheby's.
They are said to paint a picture of Jagger as a "poetic and self-aware" 25-year-old, whose affair with Hunt was a closely-guarded secret at the time.
Hunt, who became the image of Black is Beautiful and the face of the musical Hair, said after the sale: "The passage of time has given these letters a place in our cultural history."
Jagger, now 69 and living with US fashion designer L'Wren Scott, was reported not to be pleased at Hunt's decision to sell the intensely personal correspondence.
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