One of the world's oldest monarchies was faced with the absence of boys, and for a throne that does not have female succession that's a tough one to avoid, was relieved in 2006 with the much-touted birth of Prince Hisahito, youngest child, only son, of Prince Akishino, the Japanese Emperor's second son.
Crown Prince Naruhito and his wife Masako, who suffers from a nervous condition, are the parents of a nine-year old girl, Aiko. The couple did not have any other children. Prince Akishino and his wife had two daughters before the birth of their son, and back then much talk centered round the fact that the boy's gender may have been medically assured.
In today's world though, it seems anachronistic, at best, that the Imperial Throne of Japan would not allow female succession...perhaps the dynasty ought to look into it...time has arrived for change indeed!