Japan's Prime Minister Shinzo Abe visited Crown Prince Naruhito at his residence in Tokyo on Monday.
The prime minister is believed to have explained how the new era name, Reiwa, was chosen on April 1. The government has said Reiwa means "beautiful harmony" in English.
Abe is also thought to have told the Crown Prince about the government's preparations for the upcoming Imperial succession.
Emperor Akihito is set to abdicate on April 30, and the Crown Prince will ascend the throne the next day.
Abe visited the Imperial Palace last Friday to report on affairs of the state to the Emperor.
The prime minister had separate meetings with the Emperor and the Crown Prince in February and again in March.