Tysh
Tysha was the first wife of Tyrrion lannister. She was dark-haired and slender, and beautiful in Tyrion's eyes.
History
Tyrion met Tysha on a lonely road, where she was being accosted by some men. Tyrion's brother, Jaime Lannister, drove off the men while Tyrion took care of her. She was a crofter's daughter, orphaned when her father died of an illness. Tyrion fell in love with her and married her, even though he was only thirteen years old.
When Lord Tywin Lannister found out, he had Jaime tell Tyrion that Tysha was a whore who had been paid to make
Tyrion a man. Tywin then had her passed around among his guards to have sex with her; for each guard, he gave her a silver. To drive the lesson home, Tywin forced his son to be the last man, for whom Tysha was paid a gold coin, because Lannisters were worth more.
When Jaime rescued Tyrion from prison inA storm of swords, he confessed that Tysha was no whore. Tyrion realised that Tysha had been genuinely in love with him, and became furious with Jaime. He left his brother to find his own way out of the Red Keep. During his escape, he came to his father's rooms. Tyrion demanded his father tell him what had happened to Tysha. Tywin did not remember, simply stating that she went "wherever whores go". Tyrion killed him and escaped
"House Silverfist"
On his wedding night with Sansa Stark Tyrion mentions details of his previous wedding. When Sansa enquires on the identity of his previous wife, Tyrion invents a story. According to his account, his wife was Lady Tysha of House Silverfist. Their arms have one gold coin and a hundred silver, upon a bloody sheet.
This content was taken from a wiki of Ice and Fire, the original page is here http://awoiaf.westeros.org/index.php/Tysha as with Beyond The Northern Wall, a wiki of ice and fire's content is availible under the Creative Commons Attribution-ShareAlike License.