Usermaatre Meryamun Ramesses III was the second Pharaoh of the Twentieth Dynasty in Ancient Egypt. He is thought to have reigned from 1186 to 1155 BC and is considered to be the last great monarch of the New Kingdom to wield any substantial authority over Egypt. His long reign saw the decline of Egyptian political and economic power, linked to a series of invasions and internal economic problems that also plagued pharaohs before him. Wikipedia