The Republic by Plato Part 5 Page 49

Generally they call them masters, but in democratic States they simply call them rulers.

And in our State what other name besides that of citizens do the people give the rulers?

They are called saviours and helpers, he replied.

And what do the rulers call the people?

Their maintainers and foster-fathers.

And what do they call them in other States?

Slaves.

And what do the rulers call one another in other States?

Fellow-rulers.

And what in ours?

Fellow-guardians.