It was by this time well known to the Romans that there were two, and two only, convenient roads whereby Southern Mesopotamia was to be reached, one along ...

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    Old-fashioned for 'could be reached'. I'd go with ' ... two, and only two, ...'. May 22, 2020 at 15:54

1 Answer 1


The prepositional phrase "whereby Southern Mesopotamia was to be reached" means that Southern Mesopotamia could be (only) reached by the aforementioned two "convenient roads."

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