Well, heck, all of it is part of historic Turkey, and before that of historic Rome, and before that historic Persia.... Honestly, the notion is ludicrous since In Historic Times the right of conquest was, indeed, perfectly legal i.e. once the "historic Israelis" lost their hold on this territory then their claim to ownership was lost with it.
Donald Trump: Israeli settlement construction in West Bank should 'keep going' (Haaretz)
from the article: Take land swaps off the table