'Seventy Sons' in the Bible

Now Gideon had seventy sons, his own offspring, for he had many wives.

Say now in the ears of all the townsmen of Shechem, Is it better for you to be ruled by all the seventy sons of Jerubbaal or by one man only? And keep in mind that I am your bone and your flesh.

Then he went to his father's house at Ophrah, and put his brothers, the seventy sons of Jerubbaal, to death on the same stone; however, Jotham, the youngest, kept himself safe by going away to a secret place.

that the violence done to the seventy sons of Jerubba'al might come and their blood be laid upon Abim'elech their brother, who slew them, and upon the men of Shechem, who strengthened his hands to slay his brothers.