KINGS – Books known as the historical books of the Old Testament.
The two books of the Samuel (1st and 2nd Kingdoms in the Orthodox Bible) are concerned primarily with the history of Israel during the times of the Prophet Samuel, King Saul and King David. Originally one unified work, Samuel was early divided into two parts (1st and 2nd Samuel).
Like the two books of Samuel, 1st and 2nd Kings (in the Orthodox Bibles, 3rd and 4th Kingdoms) were originally one.