It took hundreds of years for sea voyages at scale across the med to become a thing, as technology improved. The reach of the empire in this diagram is mostly

It took hundreds of years for sea voyages at scale across the med to become a thing, as technology improved. The reach of the empire in this diagram is mostly due to Roman sea supremacy, but it was still difficult, expensive and prone to piracy/uppity city states. If you're interested I highly recommend this book: https://www.amazon.co.uk/d/cka/Sea-Civilization-Maritime-History-Lincoln-P-Paine/1782393587 https://www.amazon.co.uk/d/cka/Sea-Civilization-Maritime-His...