History of the Peloponnesian War

Pisistratus dying at an advanced age in possession of the tyranny, was succeeded by his eldest son, Hippias, and not Hipparchus, as is vulgarly believed. Harmodius was then in the flower of youthful beauty, and Aristogiton, a citizen in the middle rank of life, was his lover and possessed him.

Solicited without success by Hipparchus, son of Pisistratus, Harmodius told Aristogiton, and the enraged lover, afraid that the powerful Hipparchus might take Harmodius by force, immediately formed a design, such as his condition in life permitted, for overthrowing the tyranny.