Christendom refers to Christian states, Christian-majority countries or countries in which Christianity is dominant or prevails.
Icon depicting the Emperor Constantine and the bishops of the First Council of Nicaea (AD 325) holding the Niceno–Constantinopolitan Creed of 381
St. Stephen's Cathedral, Vienna
Picture of Christ in Majesty contained in an illuminated manuscript
There are few old ceramic icons, such as this St. Theodor icon which dates to c. 900 (from Preslav, Bulgaria).
A Christian state is a country that recognizes a form of Christianity as its official religion and often has a state church, which is a Christian denomination that supports the government and is supported by the government.
A Church of Denmark parish church in Holte, with the Dannebrog flying in its kirkyard
Canterbury Cathedral houses the cathedra of the Archbishop of Canterbury, the primus inter pares of the worldwide Anglican Communion
Reykjavík Cathedral, mother Church of the Evangelical Lutheran Church of Iceland
The Bible in the Norwegian language