Keturah

Incense, the wife of Abraham, whom he married probably after Sarah’s death (Gen. 25:1-6), by whom he had six sons, whom he sent away into the east country. Her nationality is unknown. She is styled “Abraham’s concubine” (1 Chr. 1:32). Through the offshoots of the Keturah line Abraham became the “father of many nations.”

M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition
Partners: Abraham
Children: Shuah, Zimran, Medan, Jokshan, Ishbak, Midian