40 years of King Solomon
At the end of king Solomon's reign the his Kingdom is split into two Kingdoms see Prophets and Divided Kingdom
Solomon started out right asking God for wisdom to lead God's people.
He had only half a heart after God and was led away from God by his own actions.
Solomon wrote a number of books in the Bible can you name them?
Background Reading:
End of the 40 Year Reign of King Solomon and his death
41 As for the other events of Solomon's reign—all he did
and the wisdom he displayed—are they not written in the book of the
annals of Solomon? 42 Solomon reigned in Jerusalem over all
Israel forty years. 43 Then he rested with his fathers and
was buried in the city of David his father. And Rehoboam his son succeeded him as king.
1 Kings 11:41-42
also read: 2 Chronicles 2:1-9:31