he last kings of Judah were all worthless. Josiah had been the last good Judean monarch. His sons Jehoahaz, Jehoiakim and Zedekiah were nothing like him. Neither was his grandson Jehoiachin. Jehoahaz (known also as Shallum) only survived for 3 months on the throne before the Egyptians removed him. He was replaced by his brother Jehoiakim (also called Eliakim). After 11 years, the Babylonians removed him from Jerusalem and allowed his son Jehoiachin (also called Jeconiah or Coniah) to sit on the throne briefly. Shortly thereafter, his uncle Zedekiah (known also as Mattaniah) was given his spot (Jeremiah 1:3).
During all this time, Jeremiah was the mouthpiece of God warning these men of the impending invasion of the Babylonians and admonishing them to surrender willingly to Nebuchadnezzar. They didn't. And, they paid for it: especially Zedekiah. Of course, there is one more Jewish king yet to come, and He paid for the sins of Israel more than all of the rest combined.
The Jews had been commanded by Moses to allow their fields to lie fallow every 7th year (Leviticus 25:4). They had not been faithful in that area. So, (2nd Chronicles 36:20-21) God allowed the people to be captured and removed from the land for 70 years. 70 Sabbaths would take 490 years at a 1 in 7 year rate. God willing, we will study that matter in a little more depth when we get into the book of Daniel.