to keep up; to retain / to maintain

a land, a large place / a country in general, a region / a country as in a nation, a state / the office of emperor, the crown; affairs of state / a province of ancient Japan

peaceful

peace

abbreviation of 平(へい)安(あん)時(じ)代(だい) (Heian jidai, “the Heian period of Japanese history”)

South Pyongan (a province of North Korea)

North Pyongan (a province of North Korea)

Heian period of Japan (794-1185 AD)

countries

a land, a large place / a country in general, a region / a country as in a nation, a state