A collection of love letters by Leonard Cohen, written for a woman, that he was inspired to write the song, ” So Long, Marianne, to write, is less than sum of € 780,000, of the hand, went to an auction at Christie’s. That’s five times the pre-estimated value. The letters are dated from a few decades ago. Marianne Ihlen, the woman to whom the mail was addressed, was the source of inspiration for several of his songs. The highest amount paid for a single letter, it was a little over 50,000 euros.