Judges 8:30

30 He had seventy sons born to him, for he had many wives.

Judges 8:30 Meaning and Commentary

Judges 8:30

And Gideon had seventy sons of his body begotten
Not after his victories, for it is plain he had children before; mention is made of Jether, his firstborn, as a youth able to draw a sword, and slay with it, ( Judges 8:20 ) but this was the number of all his sons, both before and after, and a large number it was; and the phrase "of his body begotten", or "that went out of his thigh" is used to show that they were his own sons, begotten in wedlock, and not sons that he had taken into his family by adoption, or that he was father-in-law to, having married a woman or women that had sons by a former husband; but these were all his own:

for he had many wives;
which, though not agreeable to the original law of marriage, was customary in those times, and even with good men, and was connived at; and this is a reason accounting for his having so many sons.

Judges 8:30 In-Context

28 That is the story of how the people of Israel defeated Midian, which never recovered. Throughout the rest of Gideon’s lifetime—about forty years—there was peace in the land.

29 Then Gideon son of Joash returned home.

30 He had seventy sons born to him, for he had many wives.

31 He also had a concubine in Shechem, who gave birth to a son, whom he named Abimelech.

32 Gideon died when he was very old, and he was buried in the grave of his father, Joash, at Ophrah in the land of the clan of Abiezer.