Harmodius (Greek: Ἁρμόδιος, Harmódios) and Aristogeiton (Ἀριστογείτων, Aristogeíton; both died 514 BC) were two lovers in Classical Athens who became known as the Tyrannicides (τυραννόκτονοι, tyrannoktonoi) for their assassination of Hipparchus, the brother of the tyrant Hippias, for which they were executed. A few years later, in 510 BC, the Spartan king Cleomenes I forced Hippias to go into exile, thereby opening the way to the subsequent democratic reforms of Cleisthenes. The Athenian democrats later celebrated Harmodius and Aristogeiton as national heroes, partially to conceal the role played by Sparta in the removal of the Athenian tyranny.