I think this is a really good question, with a lot of angles for debate, because of the historical relativism. Do you go for other contenders, such as Elizabeth the 1st, Catherine the Great or Wu Zetian of China? Do you go by absolute power; the power within a realm, or global power? Do you go by global reach, or power in the historical 'known' world? Is knowledge of the nuclear codes, and the role of commander in chief of a super-power's military trumped by the limitations of constitutional checks and balances? Power over the largest number of people in history, or the largest percentage?
I say she would be the most powerful woman in history, having earned it by merit, rather than circumstances of birth, and for the sheer scale of global power, relative to any other candidate in any other era. What do you think?
Here's the source article, for more context: http://sheppardpost.com/...