Japan's parliament has enacted a significant revision to the 19th-century Imperial House Law, reaffirming that only men from the paternal imperial lineage can ascend to the Chrysanthemum Throne. The move has ignited concerns about the long-term viability of the imperial family, which is already facing a demographic crisis.
The revised law, passed Friday, aims to preserve the male-only succession principle. It includes provisions to allow for the adoption of distant male relatives from imperial branches to father future heirs and permits princesses to retain their royal status even after marrying commoners. However, these measures have drawn criticism from royal watchers and experts who fear they may doom the 1,500-year-old institution.
The current emperor, Naruhito, has a 24-year-old daughter, Princess Aiko, who is popular among the Japanese public. Despite her popularity, she is ineligible to succeed her father due to the male-only rule. The line of succession now moves to Emperor Naruhito's younger brother, followed by his 19-year-old nephew, Prince Hisahito. The next in line after Prince Hisahito is the emperor's 90-year-old uncle.
Prince Hisahito is the first male heir born into the imperial family in four decades. Currently, only five of the 16 adult members of the imperial family are men, and there are no children.
The Imperative of Male Lineage
Proponents of the male-only succession, including Prime Minister Sanae Takaichi and other conservatives, argue that the male bloodline is "the only source of the emperor's authority and legitimacy." The Imperial House Law dictates that while an emperor's mother can be a commoner, only males born to royal fathers can inherit the throne. The recent revisions seek to solidify this bloodline principle by enabling the adoption of distant male relatives.
"It’s a declaration to prevent female monarchs... and to defend the male-lineage at all costs," said Hideya Kawanishi, a Nagoya University expert on monarchy. "They cannot say it’s male chauvinism, so they call it tradition."
Historically, Japan has seen female monarchs, with the last being Empress Gosakuramachi, who reigned from 1762 to 1770. The paternal-line male succession was first enshrined in the 1890 Imperial House Law, a principle largely carried over into the current 1947 version.
Public and Expert Concerns
Critics argue that the revisions are designed to prevent Princess Aiko from ascending the throne and to justify discrimination against women and a patriarchal system. Feminist scholar Chizuko Ueno stated that the new measures "treat male royals as stallions and put female royals under pressure as ‘childbearing machines’ to produce male offspring."
Concerns have been raised about the immense pressure placed on potential heirs and their future families to produce male offspring. Empress Masako, Princess Aiko's mother, reportedly developed a stress-induced mental condition, partly attributed to societal pressure for not producing a male heir.
Former Imperial Household Agency chief Shingo Haketa noted that the monarchy's future is "extremely unstable" due to the male-only succession rules and the departure of princesses who marry commoners.
Historians point out the impracticality of the male-only system in contemporary Japan, which, like many developed nations, faces an aging and declining population. The system historically relied on concubines to produce sufficient male heirs, a practice that ended around 100 years ago.
A 2005 government proposal to allow female monarchs was abandoned following Prince Hisahito's birth.
Adoption and Royal Re-entry
The more contentious aspect of the revisions allows unmarried male descendants, aged 15 or older, of distant imperial relatives of paternal lineage to be adopted into the royal family. These former royal branch families, numbering 51 members from 11 families, renounced their royal status in 1947, largely to alleviate the postwar financial strain on the monarchy. Some of these individuals are separated from the current imperial line by as many as 36 generations, with lineage splits occurring 600 years ago.
This provision has faced criticism, with some viewing it as an extraordinary effort to ensure male emperors are produced. Cartoonist Yoshinori Kobayashi questioned the public's acceptance of an adopted heir over Princess Aiko. Furthermore, re-entering the imperial family, described as "an enclave without human rights," presents significant challenges. Former royal Asahiro Kuni, who renounced his status as a child, expressed doubt that many would willingly choose such a restrictive life, which requires sacrificing personal freedoms for public duty.
Princesses and Public Perception
The revisions also allow five single princesses, including Princess Aiko and her cousin Princess Kako, to retain their royal status if they marry commoners. However, their spouses and children would not be granted royal titles. Princess Mako, Emperor Naruhito's niece, renounced her royal status upon marrying her college boyfriend, a commoner, and moved to New York, a decision widely seen as an escape from the constraints of imperial life.
Public opinion polls and surveys have shown significant support for Princess Aiko's succession. Many view her as a legitimate heir, citing the historical precedent of female emperors. Emperor Naruhito has expressed hope that discussions surrounding the measures would reach a conclusion that "will gain understanding of the people," a statement interpreted by some palace watchers as nuanced disapproval.
Former Emperor Akihito, who abdicated in 2019, is reported to support Princess Aiko's succession. His remarks in the past about the importance of female royals and their role in serving the people's happiness have been interpreted as support for female monarchs.
Japan also enacted a separate, controversial law on Friday prohibiting the desecration of its national flag, a legislative push by Prime Minister Takaichi that opponents view as an attempt to stifle criticism.