The Roman Empire was so big, its belly-button had an echo.
As time went by, the Roman Empire grew bigger and bigger. How big? When it sat around the Mediterranean Sea, it SAT AROUND the Mediterranean Sea. It extended north into the British Isles; west as far as the coast of Spain; south to include Egypt and east as far as Mesopotamia. The space it took up was 2.2 million square miles. One hundred and twenty million people lived in the Roman Empire.
That’s huge. There weren’t cell phones, tv or radio for one end of the empire to instantly communicate with the other. You could send a letter, which had to be carried by someone walking or riding a horse. Managing such a big area—especially guarding the borders from Rome’s enemies—was really difficult. There were roads and bridges and waterways that needed to be built and maintained. It was becoming too much of a headache for just one emperor.
The Romans tried having more than one emperor at the same time, which sorta kinda worked for a while. By ad 285 the Emperor Diocletian decided it was too big and split the empire into two halves. The city of Rome continued to be the capital of the western half. Byzantium became the capital of the eastern half. Together they were still called The Roman Empire. Separately each half began to take on a distinct and different character.
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