This is a map of the conquest of Britain by Anglo Saxons.
The history of England is a history of conquests.
I don’t know who came before the Celts. But they were invaded by Rome.
Then came the Anglo Saxons. That conquest was so devastating I read somewhere there is no male Celtic DNA in England. Then they in turn were conquered by the Normans.
Toddlers take what they want, even if it means slugging their baby sibling who has it. As parents we try to teach them not to do that.