Agis and Cleomenes
Plutarch
Plutarch. Plutarch's Lives, Vol. X. Perrin, Bernadotte, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1921.
And now to resume; Cleomenes, when day came, published a list of eighty citizens who must go into exile, and removed all the ephoral chairs except one; in this he purposed to sit himself for the transaction of public business. Then he called a general assembly and made a defence of his proceedings. He said that Lycurgus had blended the powers of senate and kings, and that for a long time the state was administered in this way and had no need of other officials.
But later, when the Messenian war proved to be long, the kings, since their campaigns abroad left them no time to administer justice themselves, chose out some of their friends and left them behind to serve the citizens in their stead. These were called ephors, or guardians, and as a matter of fact they continued at first to be assistants of the kings, but then gradually diverted the power into their own hands, and so, ere men were aware, established a magistracy of their own.