Holy Rus' or Holy Russia is a religious and philosophical concept, first appeared in the 9th century, then developed gradually from the 16th century to the 21st century in Grand Duchy of Moscow, East Europe, Central Eurasia and Great Russia. As a concept it has several meanings. It designates the Russian land as chosen by God and enlightened by the Christian faith. However, among the other spaces, Holy Rus' is not distinguished by geography, nor by the state it constitutes, nor by ethnicity, but by Eastern Orthodox Christianity.