Japan’s imperial lineage faces historic revision as royal family continues to shrink

Japan’s parliament has approved a historic revision to the 19th-century Imperial House Law this week by reaffirming that only men of paternal royal lineage can become emperor. While similar succession systems exist in several other monarchies, the decision has sparked renewed concern in Japan over the future of the country’s centuries-old imperial institution against the backdrop of a shrinking royal family.

The revisions, announced on July 17, allow distant male relatives of the imperial family to be adopted in order to preserve the male succession line, as AP reported, while also permitting princesses to retain their royal status after marrying commoners.

However, royal experts and observers warn that the measures could further endanger the 1,500-year-old hereditary institution by maintaining a male-only succession system. The concern is amplified when considering that only five of the current imperial family’s 16 adult members are men.

Under the Imperial House Law, an emperor’s mother can be a commoner, as is the case with the current emperor, but only male descendants born to men with royal blood are eligible to inherit the throne.

Diminishing female role

According to the article, the revised law is intended to preserve the paternal-line male succession principle by allowing distant male relatives to continue the royal bloodline. It also effectively excludes Emperor Naruhito’s daughter, Princess Aiko, from consideration as a future monarch.

Japan has previously had eight female monarchs in its history, with the last being Empress Gosakuramachi, who ruled from 1762 to 1770. However, the current male-only succession rule was first established under the 1890 Imperial House Law, introduced during a period when Japan strengthened patriarchal institutions, and was largely carried over into the 1947 postwar version.

Prime Minister Sanae Takaichi and other conservative lawmakers have defended the system, arguing that the male bloodline is “the only source of the emperor’s authority and legitimacy.”

Princess Aiko’s uncertain future

The 24-year-old daughter of Emperor Naruhito, remains highly popular among the Japanese public, with many citizens supporting Princess Aiko as becoming the next emperor. However, under current law, she is barred from succession because she is a woman.

Instead, the line of succession would pass first to the emperor’s younger brother, followed by his 19-year-old nephew Prince Hisahito. After him, the next heir is the emperor’s 90-year-old uncle.

According to AP, the latest revisions have triggered protests from critics who argue that the government’s approach is designed to remove Princess Aiko from consideration and preserve a system rooted in gender discrimination and patriarchal traditions.

By Nazrin Sadigova