Book of Lamentations in Wikipedia

The Book of Lamentations (Hebrew: אֵיכָה‎, Eikha, ʾēḫā(h)) is a book of the Hebrew Bible. In Judaism it is traditionally recited on the fast day of Tisha B'Av and in Christianity it is traditionally read during Tenebrae of the Holy Triduum. It is called in the Hebrew canon 'Eikhah, meaning "How," being the formula for the commencement of a song of wailing. It is the first word of the book (see 2 Sam. 1:19-27). The Septuagint adopted the name rendered "Lamentations" (or "Threnoi Hieremiou", abbreviated "Thren." in some Latin commentaries, from the Greek threnoi = Hebrew qinoth) now in common use, to denote the character of the book, in which the prophet mourns over the desolations brought on Jerusalem and the Holy Land by the Chaldeans. In the Hebrew Bible (the Tanakh) it is placed among the Ketuvim, the Writings. Many people believe Jeremiah was the author, but they still to this day, do not know for sure...

Link: https://en.wikipedia.org/wiki/Book_of_Lamentations