Empress Genmei
Coming of age ceremonies have been celebrated in Japan since at least 714 CE, during the reign of Empress Genmei when a young prince donned new robes and a hairstyle to mark his passage into adulthood. The holiday was first established in 1948, to be held every year on January 15. In 2000, as a result of the Happy Monday System, Coming of Age Day was changed to the second Monday in January.