Ruth was a Moabitess whose father, Elimelech, had settled in the land of Moab. On the death of Elimelech and Mahlon, Naomi came with Ruth, her daughter-in-law, who refused to leave her, to Bethlehem, the old home from which Elimelech had migrated. There she had a rich relative, Boaz, to whom Ruth was eventually married. She became the mother of Obed, the grandfather of David. Thus Ruth, a Gentile, is among the maternal progenitors of Jesus (Matt. 1:5).
Initial text from Easton's Bible Dictionary, 1897 -- Please update as needed