2 Kings 11:1

Then he came to his father’s house at Ophrah and killed his brothers the sons of Jerubbaal, seventy men, on one stone. But Jotham the youngest son of Jerubbaal was left, for he hid himself.

The king also said to Shimei, “You know all the evil which you acknowledge in your heart, which you did to my father David; therefore Yahweh shall return your evil on your own head.

Now it happened that when the letter came to them, they took the king’s sons and slaughtered them, seventy persons, and put their heads in baskets, and sent them to him at Jezreel.

Now Athaliah the mother of Ahaziah saw that her son had died. So she rose and destroyed all the royal seed of the house of Judah.

Athaliah Reigns over Judah