abstract:Thamphthis is the hellenized name of an ancient Egyptian ruler (pharaoh) of the 4th dynasty in the Old Kingdom, who may have ruled around 2500 BC under the name Djedefptah for between two to nine years. His original Egyptian name is lost, but it may have been Djedefptah or Ptahdjedef ("he endures like Ptah") according to William C.