The tomb of King SenebKay (Circa 1650BC)* was discovered in January 2014, and prior to this there had been no record of this King of the Second Intermediate period.
Further to this, archaeologists believe his burial site is just part of a necropolis of a forgotten Dynasty in Abydos, yet to be exhumed.
However it is the recent results of the forensic examination on his skeleton, revealing shocking insights into his most brutal death, that have lead scholars to hypothesise that King SenebKay may have fought against the Hyskos during the second intermediate period (Dynasties 13 to 17). This premise is significant as previously it has been thought that King Senakhtenre was probably the first to take arms against the Hyskos. Although Senakhtenre was also unsuccessful in his quest to regain upper Egypt, his attempts (and those of his successor, Seqenenre Tao 11 ‘The Brave’) are believed to have inspired his grandson’s Kamose and Ahmose to also take up arms, but it was Ahmose who finally succeeded in reunifying Upper and Lower Egypt.
This great and significant victory by Ahmose 1 began the golden age of the Egyptian Empire.
Here is a link to further information on not just the lost King SenebKay, but on the possible discovery of a whole lost Dynasty! http://www.sci-news.com/archaeology/science-senebkay-pharaoh-ancient-egypt-01698.html
Follow the link below for more information on King SenebKay’s forensic report. 
http://luxortimesmagazine.blogspot.nl/2015/02/american-egyptologists-prove-pharaoh.html