Harmodius and Aristogeiton

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.

Source: Wikipedia — Harmodius and Aristogeiton (CC BY-SA 4.0)