Assume a unified Roman Empire, encompassing, at minimum, its ‘usual borders,’ and surviving to the present. Where would this Empire likely pick its Prime Meridian to run through?
To me, this would likely be determined by either politics or convenience - the latter more about where the corresponding international date line would end up. The only difficult points I can imagine would be Constantinople or Jerusalem. As it is, running it through Rome results in Alaska being in the Eastern Hemisphere, but the IDL can be squiggly.
On thay note, I could also see Roman cartographers picking an arbitrary point, such as the westernmost point in Mainland Europe or Africa, simply to keep the whole continent(s) in the same hemisphere. That would result in some corresponding squiggliness with Kamchatka being in the Western Hemisphere.
To me, this would likely be determined by either politics or convenience - the latter more about where the corresponding international date line would end up. The only difficult points I can imagine would be Constantinople or Jerusalem. As it is, running it through Rome results in Alaska being in the Eastern Hemisphere, but the IDL can be squiggly.
On thay note, I could also see Roman cartographers picking an arbitrary point, such as the westernmost point in Mainland Europe or Africa, simply to keep the whole continent(s) in the same hemisphere. That would result in some corresponding squiggliness with Kamchatka being in the Western Hemisphere.