Early Christianity, Byzantium, Islam, and Medieval Europe.
13327_The_Crusades_Pilgrimage_or_Holy_War_.html
13323_Christianity_from_Judaism_to_Constantine.html
13324_Fall_of_Rome_the_Roman_Empire_in_the_15th_Century.html
13325_Islam_the_Quran_and_the_Five_Pillars_all_without_a_flamewar.html
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