It comes from the Greek word, arkhein (to rule) , arhko (I rule), arkhe (rule). -arium is a suffix from Latin, and is used to form nouns usually stating a place. -cide is a suffix with two related meanings.. I hope this has helped
Personally, I think it's because it was simple and free entertainment. Given that there wasn't a taboo around death and watching others die, and it actually being encouraged, like how it was in Anciient Rome, I'd say a lot of people would actually at least try out visiting a gladiatorial contest.
On November 27, 1095, Pope Urban II makes perhaps the most influential speech of the Middle Ages, giving rise to the Crusades by calling all Christians in Europe to war against Muslims in order to reclaim the Holy Land, with a cry of “Deus vult!” or “God wills it!”
