Numbers 25:16

Now the name of the Israelite that was slain, [even] that was slain with the Midianitish woman, [was] Zimri, the son of Salu, a prince of a chief house among the Simeonites.

And the name of the Midianitish woman that was slain [was] Cozbi, the daughter of Zur; he [was] head over a people, [and] of a chief house in Midian.

Vex the Midianites, and smite them:

For they vex you with their wiles, wherewith they have beguiled you in the matter of Peor, and in the matter of Cozbi, the daughter of a prince of Midian, their sister, which was slain in the day of the plague for Peor's sake.