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Japan's cabinet approved a bill on Friday that would allow Emperor Akihito to step down, paving the way for the first abdication by a Japanese emperor in nearly two centuries.
The 83-year-old emperor, who has had heart surgery and prostate cancer treatment, said in rare public remarks last year he feared age might make it hard for him to fulfill his duties.
Akihito has sought to soothe the wounds at home and abroad of World War Two, which was fought in his father Hirohito's name, and to bring the imperial family closer to the Japanese people. He will be succeeded by Crown Prince Naruhito, 57.
The bill will be sent to parliament, where lawmakers are aiming to pass it before the current session ends next month.
While no definite plan for an abdication has been confirmed, media have said it will likely take place in late 2018, which would mark nearly 30 full years on the throne for the emperor.
Abdication is not possible under current law and the last time an emperor stepped down was in 1817.
The bill is one-off legislation that would allow only Akihito to step down, with no provisions for future emperors.
The crown prince has one teenage daughter, Aiko, who cannot inherit the throne.
In 2005, with hopes for a male heir fading, then-prime minister Junichiro Koizumi prepared to challenge a 1947 law limiting succession to male descendants of an emperor. But the proposal was shelved after Hisahito was born the next year.
Both steps have been suggested as ways to deal with a shortage of male heirs and a shrinking pool of royals generally, a problem thrust back into the limelight this week, with news that Akihito's eldest granddaughter will marry a commoner, after which she too must become a commoner.
