Keturah A secondary wife or concubine taken by Abraham, whether in Sarah's lifetime or afterward is uncertain (Genesis 25:1; 1 Chronicles 1:28; 1 Chronicles 1:32). Their sons were Zimran, Jokshan, Medan, Midian, Ishbak, Shuah; they spread through the desert E. to the Persian gulf. Hagar's son Ishmael's posterity was the elder branch of the "sons of the concubines."