to keep up; to retain / to maintain

peaceful

peace

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

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

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