King George III's youngest grandchild, Princess Mary Adelaide of Cambridge, was a big woman in every way. Her circumference troubled many of her relatives. Her over-the-top personality stood in stark contrast to her daughter's shy demeanor. Her extravagant spending caused her to flee England. Her giant heart led her into many, many charitable endeavors (that frankly contributed to some of her money problems.) And, all of this together made "Fat Mary" one of England's most beloved royals with the moniker "People's Princess" that today's royalwatchers generally associate only with Princess Diana.
The Tecks with their firstborn, May
By Le Jeune (Carte de Visite)
via Wikimedia Commons