Power and height have been associated for a long time. For centuries, members of the British monarchy tied their height to their royal power. However, in reality, most of our prominent world leaders aren't particularly tall.
Barack Obama stands about 6’1", David Cameron the same, former prime minister of Canada Stephen Harper is about 6’2". Tall, but not extremely impressive. The majority of the G20 leaders stand somewhere in the five-foot range. But these guys are shrimps compared to the giant historical figures and modern-day leaders on this list. There are some leaders of tremendous stature that stood over 6’5", and one tremendous king who was over seven feet tall. Yes, these are indeed some wicked tall people from history.
Fun tidbit: Psychologists claim people who hold a lot of power tend to overestimate their heights.