* Sign languages are not monolithic: There are hundreds of different sign languages around the world, each with its own unique history and development.
* Early history is poorly documented: The earliest forms of sign language were likely developed organically and passed down through generations, leaving little written record.
* Sign language evolves: Like spoken languages, sign languages evolve and change over time, making it difficult to trace their roots definitively.
What we do know:
* Sign language is ancient: Evidence suggests that forms of sign language have existed for thousands of years. Archaeological discoveries and historical accounts point to the use of sign language in ancient Egypt, Greece, and Rome.
* Deaf communities have long used sign language: Throughout history, deaf communities have developed their own unique sign languages as a primary means of communication.
* Sign language continues to evolve: Today, sign language research and documentation are helping us better understand the history and evolution of these vibrant languages.
In short, while we can't give a specific date, we know that sign language has existed for a very long time and continues to be an essential part of Deaf cultures around the world.