The Aklo language and script was first used by the Serpent People some 1.5 million years ago, during the Pleistocene epoch. It is unlikely that this langauge was in every day use. It may be that Aklo was a ritual language only used by the priestly castes in ceremonies. There is a possiblity that the Serpent Men learnt the Aklo from the Old Ones (the lesser children of Yog-Sothoth) since those beings are known to respond to summons spoken in Aklo. To this day the Aklo language is still employed in certain spells and rituals.