* Sign Language is Ancient: Sign languages likely predate written language. Humans are visual creatures, and communication through gestures is a natural part of our development.
* Lack of Written Records: Early forms of sign language wouldn't have been documented in a way we could easily find today.
* Evolution of Sign Languages: Sign languages are dynamic, changing over time. What we see today is a result of generations of evolution.
What We Do Know:
* Evidence in Art: Cave paintings and ancient artifacts suggest that people used gestures for communication long ago.
* Deaf Communities: Deaf communities have existed throughout history. While specific sign language systems may not have been documented, the need for communication within those communities would have spurred the development of sign language.
In Summary: It's impossible to pinpoint a specific year for the earliest recorded use of sign language. However, its roots are deep in human history, likely preceding written language.