Five top true love stories

One title on the Barnes & Noble Review's list of five true love stories:
Mark and Livy: The Love Story of Mark Twain and the Woman Who Almost Tamed Him
by Resa Willis

When Samuel Clemens met Olivia Langdon in 1868, she was an invalid with little hope of regaining her health or finding a husband. He was a roughhewn writer on the rise, ten years her senior, and so smitten that he quickly proposed.