Or the Romans seizing from the Greeks?
Exactly. Original title to almost all land on earth was obtained by theft - spoils of war, eminent domain, gift of God, power to the people, whatever euphemism is used to justify it.
There's a great speech about that in "The Maltese Falcon" where Gutman (Sydney Greenstreet) justifies his theft to "the bird" (from General Kemisoff) to Spade (Humphrey Bogart).