Japan's new Emperor Naruhito ascends Chrysanthemum Throne

Japan's new Emperor Naruhito formally ascended the Chrysanthemum Throne on Wednesday, a day after his father abdicated from the world's oldest monarchy and ushered in a new imperial era.

Naruhito officially became emperor at the stroke of midnight but the process was formalised with a 10-minute ritual on Wednesday morning that was off-limits to female royals -- even his wife Masako.

It took place on the first day of the new imperial era of Reiwa, meaning "beautiful harmony", which will last throughout Naruhito's reign.

At a solemn ceremony in the Imperial Palace's Room of Pine, the 59-year-old was presented with the items his father Akihito relinquished a day earlier: sacred imperial treasures of a sword and a jewel, as well as the seal of state and his personal imperial seal.

The sole woman allowed to attend was the only female member of Prime Minister Shinzo Abe's cabinet.

Shortly afterwards, joined by Masako and other royals, Naruhito was to address the nation for the first time as