* Origins: The cockney accent developed over centuries, likely stemming from the East End of London. It's believed to have roots in the Middle English period, with influences from various dialects spoken by migrants to the city.
* Earliest Recognition: The term "cockney" itself dates back to the 16th century. It referred to a person born within the sound of Bow Bells, a reference to the bells of St. Mary-le-Bow church in the City of London.
* Formation: The distinctive features of the cockney accent, such as the dropping of the "h" at the beginning of words and the use of rhyming slang, likely solidified in the 18th and 19th centuries. This period saw significant social and economic changes in London, contributing to the development of a unique working-class dialect.
* Evolution: The cockney accent has continued to evolve over time. The influence of mass media and increased mobility have led to a more widespread and less distinct version of the accent in recent decades.
Therefore, while we can't pinpoint a precise start date, the cockney accent developed over centuries, with its core features solidifying in the 18th and 19th centuries.