Wikipedia
Mo-nah-se-tah or Mo-nah-see-tah (c. 1851 - 1922), aka Me-o-tzi, was the daughter of the Cheyenne chief Little Rock. Her father was killed on November 28, 1868, in the Battle of Washita River when the camp of Chief Black Kettle, of which Little Rock was a member, was attacked by the 7th U.S. Cavalry under the command of Lt. Colonel (brevet Major General) George Armstrong Custer. Mo-nah-se-tah was among the 53 Cheyenne women and children taken captive by the 7th Cavalry after the battle.
Allegedly, according to Captain Frederick Benteen, chief of scouts Ben Clark, and Cheyenne oral history, Custer had a sexual relationship with the 17-year-old Mo-nah-se-tah during the winter and early spring of 1868-1869. Mo-nah-se-tah gave birth to a child in January 1869, two months after the Washita battle; Cheyenne oral history alleges that she later bore a second child, fathered by Custer, in late 1869. Custer, however, had apparently become sterile after contracting venereal disease at West Point, leading some historians to believe that the father was really his brother Thomas.