The Sword of Damocles is an object in a Greek legend that is designed to illustrate the perils of being in a position of power. The term is often used in popular culture to talk about an imminent threat or peril, with the idiom used in reference to such a threat dating back to around 1747, along with the related concept of “hanging by a thread.” The story of Damocles is relatively brief, and as a result, many people are familiar with it.
According to legend, Damocles was a courtier in the palace of Dionysius II, a king who ruled Syracuse in the 4th century BCE. Like many courtiers, Damocles constantly flattered the king, in the hopes that he would be given a position of greater power in the court. Apparently, Dionysius tired of the constant flattery, and he asked Damocles if the courtier would like to switch places for a day, to see what it would be like to be a ruler.
Damocles eagerly assented, and spent a day being waited on by the king and other attendants. Towards the end of the day, while seated at dinner, Damocles looked up to see a heavy sword suspended directly over his head, hanging by a hair. In a panic, he asked Dionysius about the meaning of the sword, and the ruler explained that he wanted to show Damocles what it was like to be in a position of power, which might seem privileged from a distance to the casual eye but was actually quite dangerous.
The sword terrified Damocles into fleeing the court, with no more thoughts of power in his head, and the parable about the Sword of Damocles became a symbol for the hidden dangers of power. Timaeus, an Ancient Greek historian, recounted the parable, and it was picked up by Cicero several centuries later, entering popular culture in Europe. In the 17th century, the concept appeared in many works by popular authors and artists, making many people in the West familiar with the idea even if they hadn't read Cicero.
The concept of hanging by a thread as a leader is very poignant. It illustrates the incredible danger that many leaders find themselves in, as they are often beset on all sides both literally and figuratively, making their positions far from enjoyable. The Sword of Damocles is a somber reminder that power comes with many dangers attached.