John Gill, on Acts 13:19

And when he had destroyed seven nations in the land of Canaan,.... The Canaanites, Hittites, Amorites, Perizzites, Hivites, Jebusites, and Girgashites; and the name of seven nations is what they are usually called by in Jewish writings; and though they were not utterly destroyed, or everyone of them put to death, or driven out, for some remained to be thorns in the sides of the Israelites; yet they were so wasted and conquered, that they could never recover any more: he divided their land to them; every tribe had its portion of it assigned, by lot; see Jos 14:1. . Acts 13:20 act 13:20 act 13:20 act 13:20And after that he gave unto them judges,.... As Othniel, Ehud, Deborah, Gideon, Abimelech, Tola, Jair, Jephthah, Ibzan, Elon, Abdon, Samson, and Eli: about the space of four hundred and fifty years; not that from the division of the land of Canaan among the tribes, to Samuel the prophet, was such a space of years; for from the coming of the children of Israel out of Egypt, to the year that Solomon began to build the temple, were but four hundred and fourscore years, Kg1 6:1 and out of these must be taken the forty years the children of Israel were in the wilderness, and seven years in subduing the land of Canaan, before the division of it, which reduce this number to four hundred and thirty and three; and from hence must be deducted the time of Samuel's judging Israel, the reigns of Saul and David, and three years of Solomon's, which reduced the years of the judges to less than four hundred years; and according to some, the years of the judges were three hundred and fifty seven; and according to others, three hundred and thirty nine, and both fall short of the space of years here assigned. The Alexandrian copy and the Vulgate Latin version read this clause in connection with the preceding words, "he divided their land unto them, about the space of four hundred years, and after that he gave unto them judges"; agreeably hereunto the Ethiopic version renders it, "and after four hundred and fifty years, he set over them governors, &c". So that this account respects not the time of the judges, or how long they were, but refers to all that goes before, and measures out the space of time from God's choice of the Jewish fathers, to the division of the land of Canaan: and reckoning from the birth of Isaac, when the choice took place, and in whom Abraham's seed was called, there was much about such a number of years; for from the birth of Isaac to the birth of Jacob, were sixty years; from thence to his going down into Egypt, an hundred and thirty years; and from thence to the Israelites coming out of Egypt, two hundred and ten years; and from thence to their entrance into the land of Canaan, forty years; and from that time to the division of the land, seven years, which in all make four hundred and forty seven years: so that, according to this account, there were three years wanting of the sum in the text; hence the apostle might with great propriety say, that it was about the space of so many years. It follows, until Samuel the prophet; the meaning of which, is not that there was such a space of time as before mentioned, from the distribution of the land of Canaan until the times of Samuel the prophet, during which space judges were given; but that after that term of time was expired, God gave them judges, or raised up one after another, until Samuel the prophet, who was the last of them: of his character as a prophet; see Gill on Act 3:24 and which is a title frequently given him by Jewish writers (u). (u) Maimon. Cele Hamikdash, c. 4. sect. 3.