I've really come to admire the Byzantines' example in history. They virtually sustained high civilization for much of the Dark Ages and most of the Medieval period. Their armies were professional and their civil life was rich, often provoking spite from those who had never eaten with forks to the west. Their leaders include many great men in their ranks, whose influence affected considerations all across the continent by lesser rulers (though their system was a little too dependent on the emperor, meaning one invalid could ruin the entire empire). The Crusades were borne entirely out of a Byzantine request to the Pope to send a modest force to help drive back the Muslims. And by sitting implacably at the crossroads of Asia Minor and Eastern Europe, they proved a long-lasting obstacle to Islamic expansionism. When the Empire was stretched thin, the Byzantines were able to rely on some of the finest military tactics and intelligence of the age, as Byzantine commanders and soldiers valued intellect and discipline over the impetuous bravery of Western knights. These guys really seem to be the high point of life during that entire historical period. After having to learn about Western Europe and petty squabbles so much in history classes, it's a little refreshing to read about ordered and civilized life in Constantinople. These guys had class. And here's another tidbit I found while reading about their armies:
Despite the importance the Byzantine Empire (or Ρωμανία, as it called itself) attached to its position as the defender of true, orthodox Christianity against Muslim and Catholic alike, it is worth noting that the Empire never developed or understood the concept of a "holy war." Its neighbours' concepts of Jihad and Crusade seemed to it gross perversions of scripture or simple excuses for looting and destruction. Emperors, generals and military theorists alike found war to be a failing of governance and political relations, to be avoided whenever possible. Only wars waged defensively or to avenge a wrong could in any sense be considered just, and in such cases the Byzantines felt that God would protect them.
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It's too bad the Byzantines didn't survive in some form to the modern age, even if it were a simple island nation in Rhodes or Cyprus. To have the heir and bloodline of the Roman Empire still kicking in the 21st century would be interesting.