Christendom refers to the regions, societies, and cultures where Christianity has historically been dominant or influential. It encompasses not only religious aspects but also social, political, and cultural dimensions.
Related terms
Catholicism: The largest branch of Christianity led by the Pope based in Rome.
Protestant Reformation: A movement in 16th-century Europe that resulted in the establishment of various Protestant denominations separate from Catholicism.
Crusades: Military campaigns initiated by Christians during medieval times with the goal of reclaiming holy sites from Islamic control.