Book of Lamentations
The five relatively short books of [[Song of Songs]], [[Book of Ruth]], the [[Book of Lamentations]], [[Ecclesiastes]] and [[Book of Esther]] are collectively known as the "Hamesh Megillot" ([[Five Megillot]]). These are the latest books collected and designated as "authoritative" in the Jewish canon even though they were not complete until the 2nd century CE.