Semerkhet is the Horus name of an early Egyptian king who ruled during the 1st dynasty. This ruler became known through a tragic legend handed down by ancient Greek historian Manetho, who reported that a calamity of some sort occurred during Semerkhet's reign. The archaeological records seem to support the view that Semerkhet had a difficult time as king and some early archaeologists even questioned the legitimacy of Semerkhet's succession to the Egyptian throne.
Manetho named Semerkhet Semêmpsés and credited him with a reign of 18 years, whilst the Royal Canon of Turin credited him with an implausibly long reign of 72 years.Egyptologists and historians now consider both statements as exaggerations and credit Semerkhet with a reign of 8½ years. This evaluation is based on the Cairo Stone inscription, where the complete reign of Semerkhet has been recorded. Additionally, they point to the archaeological records, which strengthen the view that Semerkhet had a relatively short reign.