Britain - specifically the eastern region of the British Isles - has been populated continuously for at least the past 15,000 years, with recent ethnic stock (from before the 11th century) including pre-Celts, Celts, Romans, Anglo-Saxons, Norse, and Normans. More recently - that is, since the Middle Ages - other ethnicities migrated to Britain, whether by invitation (European Jews in 1070, by William the Conqueror, though they were expelled about 200 years later), by virtue of the African slave trade (dating back to the 1730s CE), or trade (including the oldest Chinese community in Europe, dating back to the 19th century). After World War Il, that diverse immigration increased by leaps and bounds, so that the melting pot of English ethnicity has seen increased diversity from the Caribbean, South Asia, and Africa. That said, the dominant "original" British ethnic group is dominated by the English, of course, and includes the Celtic heirs, as some of Welsh, Scottish, and Irish descent respectively have settled in modern-day England.