2-kings 23:19

That were in the cities of Samaria - Israel had now no king; and Josiah, of the blood royal of Judah, had certainly a direct right to the kingdom; he had, at this time, an especial commission from God, to reform every abuse through the whole land - all that ground that was given by the Lord as an inheritance to the twelve sons of Jacob. Therefore he had every right to carry his plans of reformation into the Samaritan states.

The cities of Samaria - The reformation which Josiah effected in Samaria, is narrated in Chronicles. It implies sovereignty to the furthest northern limits of Galilee, and is explained by the general political history of the East during his reign. Between 632-626 B.C. the Scythians ravaged the more northern countries of Armenia, Media, and Cappadocia, and found their way across Mesopotamia to Syria, and thence, made an attempt to invade Egypt. As they were neither the fated enemy of Judah, nor had any hand in bringing that enemy into the country, no mention is made of them in the Historical Books of Scripture. It is only in the prophets that we catch glimpses of the fearful sufferings of the time Zephaniah 2:4-6; Jeremiah 1:13-15; Jeremiah 6:2-5; Ezekiel 38; 39. The invasion had scarcely gone by, and matters settled into their former position, when the astounding intelligence must have reached Jerusalem that the Assyrian monarchy had fallen; that Nineveh was destroyed, and that her place was to be taken, so far as Syria and Palestine were concerned, by Babylon. This event is fixed about 625 B.C., which seems to be exactly the time during which Josiah was occupied in carrying out his reformation in Samaria. The confusion arising in these provinces from the Scythian invasion and the troubles in Assyria was taken advantage of by Josiah to enlarge his own sovereignty. There is every indication that Josiah did, in fact, unite under his rule all the old "land of Israel" except the trans-Jordanic region, and regarded himself as subject to Nabopolassar of Babylon.