The first identifiable inhabitants of the British Isles (later the United Kingdom) were the **Celts** (or **Britons**), arriving from continental Europe around **600–500 BCE** (Iron Age).
**Beaker People** (c. 2500 BCE) brought bronze, single burials, Stonehenge Phase 3. **Neolithic farmers** (c. 4000 BCE) built long barrows, causewayed enclosures, Stonehenge Phases 1–2. **Mesolithic hunter-gatherers** (c. 9000 BCE) — Cheddar Man (DNA: dark skin, blue eyes).
The **Celts** are the first *historically attested* group with a distinct language and culture directly ancestral to modern British minorities (Welsh, Cornish, Scots Gaelic via Irish migration).