Thampthis in the context of Ptah

Shepseskaf (meaning "His Ka is noble") was a pharaoh of ancient Egypt, the sixth and probably last ruler of the fourth dynasty during the Old Kingdom period. He reigned most probably for four but possibly up to seven years in the late 26th to mid-25th century BC.

Shepseskaf's relation to his predecessor Menkaure is not entirely certain; he might have been his son or possibly his brother. The identity of his mother is highly uncertain as she could have been one of Menkaure's consorts or queen Khentkaus I or Neferhetepes. Similarly, Shepseskaf's relation to his probable successor on the throne, Userkaf, is not known although in the absence of clear indication of strife at the transition between the fourth and fifth dynasties, Userkaf could well have been his son or his brother. If Shepseskaf was succeeded directly by Userkaf rather than by Thampthis as claimed by some historical sources, then his death marks the end of the fourth dynasty. The transition to the fifth dynasty seems not to have been a sharp rupture but rather a continuous process of evolution in the king's power and role within the Egyptian state. Around this time, some of the highest positions of power such as that of vizier which had hitherto been the prerogative of the royal family were opened to nobles of non-royal extraction.