Who was 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.

Keturah first appears in Genesis 25:1. In this repository’s biblical text, this figure is associated with 4 verse mentions across 2 books, most notably Genesis, 1 Chronicles.