/r/askhistorians
In the High Middle Ages, why were many pagan monarchs referred to as 'Grand Princes' or 'Grand Dukes', rather than kings?
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The reasons for the split between Catholicism and Protestantism is fairly well known and discussed. The split between Catholicism and Eastern Orthodoxy, however, is often overlooked. Why and when did this split occur? What are the main similarities and differences between the two?
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Why was a runner used instead of a horse during the Battle of Marathon to deliver the news of the Persian's defeat to Athens? Wouldn't a horse be much faster?
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According to Demographic records, the Free Black population outnumbered the Slave population in Delaware from 1800 onward, and was 10x the slave population in 1860. How different was slave society in a state where the Black population was mostly free?
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The ancient Christian writer Justin Martyr argued around 150 AD that skeptics should just go to Bethlehem and look at the tax records. Would the Roman government have reasonably retained tax / census records that long?
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Why most former colonies, especially Brazil, are less advanced compare to Australia, USA, Canada etc? Despite the fact that Australia and Canada have hazardous climate, or geography.
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