Histories

Isagoras, who was on the losing side, devised a counter-plot, and invited the aid of Cleomenes, who had been his friend since the besieging of the Pisistratidae. It was even said of Cleomenes that he regularly went to see Isagoras' wife.

Then Cleomenes first sent a herald to Athens [23.7333,37.9667] (Perseus)Athens demanding the banishment of Cleisthenes and many other Athenians with him, the Accursed, as he called them. This he said in his message by Isagoras' instruction, for the Alcmeonidae and their faction were held to be guilty of that bloody deed while Isagoras and his friends had no part in it.