Olivia Langdon:

Twain's wife for 34 years. She was a great motivator in his life when it came to his writing. When he would finish a manuscript he would pass it on to her for approval to see whether or not it was ready for sending it on to the publisher. Livy, as Twain referred to her, had a great influence on such books as Tom Sawyer and The Adventures of Hucklebery Finn.

Twain's comment on Olivia when he glimpsed his future wife-to-be:
"I saw her in the form of an ivory miniature in her brother Charley's stateroom in the steamer Quaker City, in the Bay of Smyrna, in the summer of 1867, when she was in her twenty-second year"*

* Kaplan, Justin, Mr. Clemens and Mark Twain, Simon and Schuster, NY, 1966, p.52