So according to the 'chart' above, it was "COLD" during the...

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    So according to the 'chart' above, it was "COLD" during the Greek empire and "WARM" during the Roman empire, so I guess the river was frozen and then it thawed? The Greeks had to skate over it but the Romans could swim through it? Or did they build bridges?

    Here's a proper chart with a Y axis and scale from Wikipedia:

 
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