The Republic by Plato Part 8 Page 67

the slave bought with money, whether male or female, is just as free as his or her purchaser; nor must I forget to tell of the liberty and equality of the two sexes in relation to each other.

Why not, as Aeschylus says, utter the word which rises to our lips?

That is what I am doing, I replied; and I must add that no one who does not know would believe, how much greater is the liberty which the animals who are under the dominion of man have in a democracy than in any other State: for truly, the she-dogs, as the proverb says, are as good as their she-mistresses, and the horses and asses have a way of marching along with all the rights and dignities of freemen; and they will run at any body who comes in their way if he does not leave the road clear for them: and all things are just ready to burst with liberty.