Judges 9:5

Now Gideon had seventy sons who were his direct descendants, for he had many wives.

“Speak, now, in the hearing of all the lords of Shechem, ‘Which is better for you, that seventy men, all the sons of Jerubbaal, rule over you, or that one man rule over you?’ Also, remember that I am your bone and your flesh.”

but you have risen against my father’s house today and have killed his sons, seventy men, on one stone, and have made Abimelech, the son of his maidservant, king over the lords of Shechem, because he is your relative—

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.

So Jehoram arose over the kingdom of his father and strengthened himself, and he killed all his brothers with the sword, and some of the commanders of Israel also.