http://agathe.gr/democracy/marble_stele.html
Law Against Tyranny In 338 B.C. Philip II of Macedon and his son Alexander defeated the Athenians and other Greek states in a battle at Chaironeia in central Greece. In the following year (337/6 B.C.) ... As the text explains, Eukrates made the motion, and the question was put to a vote in the archonship of Phrynichos. The law was inscribed on two stelai (stone markers) to be set up at the entrances of the Bouleuterion (senate house) and the ekklesia (assembly). The text of the decree reads: In the archonship of Phrynichos, in the ninth prytany of Leontis for which Chairestratos, son of Ameinias, of Acharnai, was secretary; Menestratos of Aixone, of the proedroi, put the question to a vote; Eukrates, son of Aristodimos, of Peiraeus, made the motion; with Good Fortune of the Demos of the Athenians, be it resolved by the Nomothetai [lawgivers]: If anyone should rise up against the Demos for tyranny or join in establishing the tyranny or overthrow the Demos of the Athenians or the democracy in Athens, whoever kills him who does any of these things shall be blameless.