Western civilization’s eastern boundary set by 1200 and barely moved since

Evidence

During the same period, Hungary, Poland, Scandinavia, and the Baltic coast were converted to Western Christianity, with Roman law and other aspects of Western civilization following, and the eastern boundary of Western civilization was stabilized where it would remain thereafter without significant change. — Samuel P. Huntington, The Clash of Civilizations and the…, 138

Categorization

• XREF: Directly relevant to today’s Ukraine-Russia civilizational border debates; connects to Huntington’s enduring boundary thesis.