Gyges took power by murdering the former king Candaules and marrying his widow. He became the founder of the Mermnad dynasty in Lydia.
Citation:
Bouchard, Elsa. "Kingship of Gyges in Lydia".
The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11147, accessed 21 May 2013.]