When pharaoh Sened was in power Egypt was probably divided once again into its southern and northern parts, with him as the king in North (Lower) Egypt from the capital Memphis. In the Turin Canon the length of his reign is lacking but a notation of (at least) 70 years indicates his age when he died.
There are no contemporary remains of him, not even the smallest writing is found so far. A possible exception is a block of stone with his name on it, that was found and reused as building material in the mortuary temple of fourth dynasty king Khafre (Khefren) at Giza. This piece might just be of second dynasty origin and thus contemporary to Sened.
Another remain with his name is from a private fourth dynasty tomb in Sakkara where a man called Shery has a title that tells that he is connected with the cult commemorating king Sened. This is a couple of hundred years after his death. The text also mentions king Peribsen who probably was Sened's counterpart in the southern part of the country at the same time. All other material sources science have about him are made in later times and one remarkable object is a statuette from 2000 years after his death made in the 800s BC.
Though considered to be very insignificant by today's Egyptologists since he has left no remains of substance anywhere in Egypt, he obviously had a strong position in the minds of later Egyptian generations. The reason for this is so far concealed to science. Another fact pointing in the same direc- tion is that he was put in to the king-lists among the much more famous colleagues of his. His name thus appears in the Abydos list (picture above right) and in the canon from a private tomb in Sakkara where he is depicted simply by a plucked goose (pic- ture left). He is mentioned in the Canon of Turin as well, also there as a plucked goose.
Historian Manetho gives him a reign of 41 years and calls him Sethenes. If that name has something to do with the god Seth we don't know, but Egyptian records only call him Sened. His tomb has not been identified yet, but if his reign was that long he surely had the time to construct a monument of some dimen- sions.
The man mentioned above working with his mortuary cult, probably had his tomb a bit north of Djoser's complex, and the galleries west of his pyramid are a possible monument of Sened's and of other kings as well.
The answer might be given when the whole Sakkara necropolis is excavated some day, because many monuments are expected to be buried there.