Berber languages suggests that the C-Group population — which, along with the Kerma culture, inhabited the Nile valley immediately before the arrival of the first Nubian speakers — spoke Afro-Asiatic languages. Roger Blench (2018) suggests that Proto-Berber speakers had spread from the Nile River valley to North Africa 4,000-5,000 years ago due to the spread of pastoralism, and experienced intense language leveling about 2,000 years ago as the Roman Empire was expanding in North Africa. Hence, although Berber had split off from Afroasiatic several thousand years ago, Proto-Berber itself can only be reconstructed to a period as late as 200 A.D. Blench
Berber languages (2018) notes that Berber is considerably different from other Afroasiatic branches, but modern-day Berber languages display low internal diversity. The presence of Punic borrowings in Proto-Berber points to the diversification of modern Berber language varieties subsequent to the fall of Carthage in 146 B.C.; only Zenaga lacks Punic loanwords. Additionally, Latin loanwords in Proto-Berber point to the breakup of Proto-Berber between 0-200 A.D. During this time period, Roman innovations including the ox-plough, camel, and orchard management were adopted by Berber communities along the "limes", or borders of the Roman Empire. This resulted in a new trading culture involving the use