• Chivalry - it's not hard to see why later writers would want to add deeds of chivalry, because the lost kingdom idea is very good romantic literature.  But the idea of a code of knightly ethics largely evolved in the aftermath of Charlemagne's empire, which leads us to...
  
• Charlemagne, Karl the Great - his being crowned emperor happened in 800, which is centuries too late.  She may have lived at the same time as Clovis, the first of the Merovingian dynasty, but certainly not alongside a Carolean.
  
• Crusades - The First Crusade started in 1096!  Crusading was roughly as close in time to her as we are to Columbus' first voyage of discovery.
  
• Islam - And why would you need to crusade, because Mohammed had not yet begun to preach? (He does so in 613 AD.)  The whole of the Mediterranean world was Christian, at least officially.
  
• Turks living in Turkey - outside of perhaps a few merchants, Anatolia was thoroughly Greek, having been ruled by Greeks and Greek Romans for a millennium
  
• The East-West Schism - The Christian church was not divided to Roman and Orthodox -- but there were other sects like Arianism which were very dominant in Western Europe, via the Vandal and Ostrogoth, and early Lombard kings
  
• Hungarians living in Hungary - The Great Migration was in full swing at this period, with the above mentioned people and the Visigoths invading old Roman lands, but the Hungarians didn't come to Europe until the ninth century.
  
• Formal/informal distinction in Latin languages - this seems to have emerged in the Middle Ages from the imperial "royal we" getting extended to more and more petty nobles, finally becoming the tu/vous distinction.
  
• Venice - The most serene city did not yet exist, being founded later (c. 700) by Roman refugees from Lombard invaders, with many leaving from Aquileia on the land).  Nearby Ravenna did exist, and has very lovely mosaics from the same period as our Arthur/Artoria.
  
• Nationalism - This one is obvious, but just a reminder that there was no concept of a British nation back then, or a nation of all of the Gaelic-speaking peoples -- in fact invaders from the north were just as feared as Germanic people from across the seas.  Religious identity played a much larger role (on the Christian side anyway; pagans were rarely concerned with orthodoxy).
  
• Jadwiga of Poland - Okay, this one is pretty distant, but in 1382 Hedwig was crowned King of Poland, because there wasn't a rule in the student handbook that women can't be kings.  She was canonized as a Catholic saint in 1997, but is an early example of women ruling as a king.
  

Quote:Gladiators were not general-purpose warriors, but highly specialized performers, typically fighting in one of several well-defined, visibly distinct stylized combat roles. So for instance the retiarius (‘net-man’) was lightly armored, fast and fought with a net and a long trident (evoking a fisherman), typically against a secutor (‘follower, chaser’), a heavily armored fighter with a large shield, helmet and arm protections, but with only a sword. So the retiarius is less heavily armored, but faster with a longer reach weapon, while the secutor had the clear advantage in a close-in fight. Gladiators would train on a specific type and often be paired against opposing types. So the secutor and retiarius were a matched pair, but equally murmillones (heavily armored sword-and-shield fighters) were often employed against either the thraex or hoplomachus type.