This paper -- presnted originally as the Julius Stone lecture at the University of Sydney (Australia) in 2006 -- considers the application of the thesis of "supersession of historic injustice" to issues of sovereignty. The supersession thesis has ben applied in the past to historic injustice concerning land and property rghts in formler colonial contexts; but it may also be applied to the historic legacy of the unjust subjugation of a people. It considers and criticizes reversion theories, which suggest that the proper remedy for unjust subjugation is some sort of reversion to the politcal status quo ante. The paper argues that this cannot be entertained without considering the great differences in statecraft and political circumstances that may have emerged since the time of the unjust subjugation. Those considerations may affect the way we apply the principle of self-determination to these contexts.