Qin Shi Huang was the First Emperor of the Qin dynasty. He was the target of a failed assassination attempt by Jing Ke.
The full assassination attempt is detailed in a short story about Jing Ke.
The Kuruoka family obtains a catalyst to summon Qin Shi Huang as a Servant for the False Holy Grail War, believing that he will be a Heroic Spirit that requires deference even from the summoner. The mention the catalyst is a Noble Phantasm that they could also utilize themselves. He is never summoned due to their daughter obtaining Command Spells and her own Servant.