Pisistratus seized power with the help of the bodyguards granted to him by the Athenians. He was to be twice expelled from the city before he could establish a permanent tyranny c. 546 BC.
Bouchard, Elsa. "First tyranny of Pisistratus in Athens". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11162, accessed 11 March 2014.]