Keturah, Abraham’s concubine - This passage, and Genesis 25:6, sufficiently prove that the position of Keturah was not that of the full wife, but of the “secondary” or “concubine wife” Judges 19:1 so common among Orientals.
Related Commentaries of 1 Chronicles 1:32
1 Chronicles 1:32
32 Now the sons of Keturah, Abraham's concubine: she bare Zimran, and Jokshan, and Medan, and Midian, and Ishbak, and Shuah. And the sons of Jokshan; Sheba, and Dedan.