alternatehistory.com

Christendom, for these purposes, being a community of Christian nations bordering and intermittently at war with pagan and Muslim nations; the Christian nations are at least nominally under the authority of both a religious leader - a patriarch in this case, perhaps? - and a secular overlord or emperor, and at least nominally (probably very nominally in many cases!) consider their religious bonds with their fellow Christian states more important than their differences.

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