Some have argued that the Celts were illiterate because they did not develop a language of their own until the 2nd or 3rd century A.D. It is true they did not develop a written language of their own until then, but it is not true they were illiterate prior to that time. In effect, they used languages of those they came into contact with to record a variety of things (praises to various Gods, words on coins, records of ceremonies, and so forth). The languages used were typically Latin and Greek.