Britannians
Britannians is a term that historically refers to the inhabitants of Britannia, the Roman province that encompassed much of modern-day Great Britain. This term was primarily used by the Romans and later by writers in Latin to distinguish the people of the island from other groups within the Roman Empire. The native population of Britannia before and during the Roman occupation was diverse, consisting of various Celtic tribes such as the Catuvellauni, Trinovantes, and Brigantes.
Following the Roman conquest, which began in earnest in 43 AD, the concept of a "Britannian" identity
The term "Britannian" also came to be used in later historical periods to refer to the people