Viking ships were built by the Scandinavians during the Viking Age (c. ... Although before the Viking Age most boats had their planks lashed together, ... The addition of oars and sails gave Viking boats an advantage over all other ... does not mean they did not exist earlier on, however!) until the 10th century.
As of 2020, Japan's emperor, Naruhito, like Queen Elizabeth of England has no true political power. The Prime Minister of Japan, Shinzo Abe, is the Head of Japanese Government; the Emperor's role is only ceremonial.