Prayer of Manasseh
Prayer of Manasseh is a book included in the Greek Septuagint and the Vulgate, but considered apocryphal by Jews, Catholics and Protestants alike.
This short book of only 15 verses is a penetential prayer attributed to the Judean king Manasseh, who is recorded in the Bible as one of the most idolatorous (2 Kings 21:1-18). However, after having been taking captive by the Assyrians, he prays for mercy (2 Chronicles 33:10-17) and turns from his idolatorous ways.