The sum of three obols.[1]
Aristophanes in Wealth [writes]: "for [it would be] appalling, if for the sake of a triobol we were to jostle every time in the assembly."[2] Nobody served as a juror unless he was over 60 years of age.[3] Those who had become adults used to attend the assembly but did not serve as jurors. So the politicians, having persuaded the city [sc. to this effect], made it clear that these assembly-members were taking something from the city's revenues. Subsequently Cleon[4] made this a triobol. A juvenile did not attend the assembly.