Deponency has been the focus of investigation in the last decade. Some grammarians have questioned and/or denied the validity of deponency in Greek. One of the arguments used to support such a conclusion is based in ancient history. I investigate the writings of three ancient grammarians (Dionysius Thrax, Apollonius Dyscolus, and Macrobius) to determine the grammatical Sitz im Leben of voice in the ancient Greek. This inquiry establishes that deponency in Greek is a concept with roots that run deep into the ancient period, thereby refuting the challenge to Greek deponency.