Isagoras had the support of the Spartan king Cleomenes who at first was successful in expelling Cleisthenes; but the latter benefitted from a strong popular assistance and was finally restored while his rival had to withdraw.
Bouchard, Elsa. "Rivalry between Cleisthenes and Isagoras at Athens". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11176, accessed 02 October 2014.]