Manasseh the King was a king of Judah, one of the two Kingdoms of Isreal in the Old Testament. He reigned from c. 686 to 642 BCE. The writers of the Old Testament mentioned that he did evil in the eyes of the Lord, and he chose to worship other Gods than the God of Isreal. And that he committed man abominations, e.g. he sacrificed by burning children in fire to Canaanite Gods. But towards the end of his life, he was captured and sent to Assyria in chains for a while, and then he was sent back to Jerusalem. During his imprisonment, he repented and prayed this prayer.
The prayer text is considered canonical by the Catholic and the Orthodox Churches. However, other Churches debate the canonicity of this prayer. The group of texts that are discussed sometimes are referred to as Deuterocanonical. I thought to include it in this blog because expresses deep repentance.