Isagoras (Ancient Greek: Ἰσαγόρας), son of Tisander, was an Athenian aristocrat in the late 6th century BC.
[1] In 508 BC he was elected archon eponymous, but Cleisthenes opposed him, with support from the majority of the population.
In 507 BCE, Isagoras, with Cleomenes' help, expelled Cleisthenes and other members of the Alcmaeonidae family on pretext of the Alcmaeonidaean stain (see Megacles).
Cleisthenes' supporters and the ordinary Athenian citizens revolted against Isagoras' tyranny, and ended up trapping Isagoras and his Spartan allies on the Acropolis for two days.
Cleisthenes then returned to the city and implemented reforms that created Athenian democracy.