Tyrannicide

Tyrannicide is the killing or assassination of a tyrant or unjust ruler, purportedly for the common good, and usually by one of the tyrant's subjects. Tyrannicide was legally permitted and encouraged in Classical Athens. Often, the term "tyrant" was a justification for political murders by rivals, but in some exceptional cases students of Platonic philosophy risked their lives against tyrants. The killing of Clearchus of Heraclea in 353 BC by a cohort led by his own court philosopher is considered a sincere tyrannicide. A person who carries out a tyrannicide is also called a "tyrannicide".

The term originally denoted the action of Harmodius and Aristogeiton, who are often called the Tyrannicides, in killing Hipparchus of Athens in 514 BC.