Judges 10:4

And he had thirty sons that rode on thirty ass colts, and they had thirty cities, which are called Havothjair unto this day, which are in the land of Gilead.

He had thirty sons that rode on thirty ass colts. This is a characteristic trait of Eastern manners in those early times; and the grant of a village to each of his 30 sons was a striking proof of his extensive possessions. His having 30 sons is no conclusive evidence that he had more than one wife; much less that he had more than one at a time. There are instances in this country of men having as many children, by two successive wives (see 'Hebrew Wife,' p. 20).