Jeremiah 36:1

1The Lord spoke to Jeremiah in the fourth year
The fourth year that Jehoiakim…was ruling over Judah would have been 605/4 b.c. Jehoiakim began his rule in 609/8 b.c. after his father Josiah was killed by Pharaoh Necho at Megiddo. Necho had installed him as puppet king in place of his brother Jehoahaz who was deposed by Necho after a reign of only three months (2 Kgs 23:31–35). According to Jer 46:2 that was the year in which Nebuchadnezzar defeated Jehoiakim’s suzerain Necho at Carchemish. That was also the same year that Jerusalem came under attack and submitted to Babylonian control after a brief siege (Dan 1:1; see the study note on 25:1 for the reason for the difference in the dating between Jer 25:1; 36:2 and Dan 1:1). These events confirmed what Jeremiah had been saying about the foe from the north (4:6; 6:1; 15:12) and would have provided the impetus for the hopes that the people would repent if they were reminded about what Jeremiah had been saying.
that Jehoiakim son of Josiah was ruling over Judah.
Heb “This word came to Jeremiah from the Lord in the fourth year of Jehoiakim son of Josiah the king of Judah, saying.”
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