From an evolutionary perspective, it simply does not make sense for standards of beauty to be bound so tightly to culture. Humans must have some degree of innate selection characteristics, defined at a minimum by heterosexuality which selects for non cultural sexually dimorphic characteristics.

But, as another reply already mentioned, your source is likely nonsense. Further, even if it were true, consider that her "beauty" may very well have been tied to her status as a princess; in other words, suitors were disheartened by rejection less because she was attractive and more because she was royalty.

Moreover, I don't know how applicable a single, isolated locale's standards of beauty are to trends in other cultural segments.