Pillars

But since we have mentioned the pillars of Heracles, we deem it to be appropriate to set forth the facts concerning them. When Heracles arrived at the farthest points of the continents of Libya and Europe which lie upon the ocean, he decided to set up these pillars to commemorate his campaign.

And since he wished to leave upon the ocean a monument which would be had in everlasting remembrance, he built out both the promontories, they say, to a great distance; consequently, whereas before that time a great space had stood between them, he now narrowed the passage, in order that by making it shallow and narrow he might prevent the great sea-monsters from passing out of the ocean into the inner sea, and that at the same time the fame of their builder might be held in everlasting remembrance by reason of the magnitude of the structures. Some authorities, however, say just the opposite, namely, that the two continents were originally joined and that he cult a passage between them, and that by opening the passage he brought it about that the ocean was mingled with our sea. On this question, however, it will be possible for everyman to think as he may please.


- Diodorus Siculus, Library of History, Book 4, Chapter 18, Sections 4-5