EthanSolomon son of David solidified his royal authority, for YHWH his God was with him and magnified him greatly (2 Chronicles 1:1).
The Second Book of #Chronicles followed after the First Book of Chronicles in every way. 2 Chronicles narrated the kings of #Judah from #Solomon until #Zedekiah.
The Greek name of "Second Leftovers" is a bit of an overstatement, for some of the stories can also be found in 1 and 2 #Kings, but the idea is understandable. Many details can be found in 2 Chronicles which was not made known in 1 and 2 Kings.