Greek Anthology Book XIV: 9. - Riddle

Riddle

 * My father-in-law killed my husband and my husband killed my father-in-law;
 * my brother-in-law killed my father-in-law, and my father-in-law my father.

Solution
was the wife of, and the daughter of.

, who was the father of her second husband, killed both and.

, who had a reputation for being somewhat brutal, killed, the father of , and took as a wife (technically, a concubine).

Finally,, the brother of and therefore the brother-in-law of , killed her second father-in-law.