He is conducting research on historical kana usage.

He is learning Ancient Greek language.

Revisionism aims to change our understanding of past events.

The history of the Empire of Japan is very interesting.

Old Church Slavonic is the oldest recorded language of the Slavic group.

Old Church Slavonic is the first language written by the Slavs.

He said he couldn't agree with the views of the revisionists.

The Empire of Japan, written as 大日本帝國 in Kyūjitai, was a nation that existed from 1868 to 1945.

The Imperial Japanese Army was a Japanese military force that existed from the Meiji era to the Showa era.

The Imperial Japanese Navy was once the navy of Japan.