Ramesses III (also written Ramses and Rameses) was the second Pharaoh of the Twentieth Dynasty and is considered to be the last great New Kingdom king to wield any substantial authority over Egypt. According to Jürgen von Beckerath, Ramesses III reigned from March 7, 1183 to April 16, 1152 BC. This is based on his known accession date of I Shemu day 26 and his death on Year 32 III Shemu day 15 for a reign of 31 Years 1 Month and 19 days. (alternate dates for this king are 1187/1186 to 1156/1155 BC). The Ancient Greeks knew him as Rhampsinitus which is a corruption of Ramesses III's popular Egyptian name: Ra-messu-pa-neter