Of the extremities of the Pharos, the eastern is nearest to the continent and to the promontory in that direction, called Lochias, which is the cause of the entrance to the port being narrow. Besides the narrowness of the passage, there are rocks, some under water, others rising above it, which at all times increase the violence of the waves rolling in upon them from the open sea. This extremity itself of the island is a rock, washed by the sea on all sides, with a tower upon it of the same name as the island, admirably constructed of white marble, with several stories. Sostratus of Cnidus, a friend of the kings, erected it for the safety of mariners, as the inscription imports.[806] For as the coast on each side is low and without harbours, with reefs and shallows, an elevated and conspicuous mark was required to enable navigators coming in from the open sea to direct their course exactly to the entrance of the harbour. The western mouth does not afford an easy entrance, but it does not require the same degree of caution as the other. It forms also another port, which has the name of Eunostus, or Happy Return: it lies in front of the artificial and close harbour. That which has its entrance at the above-mentioned tower of Pharos is the great harbour. These (two) lie contiguous in the recess called Heptastadium, and are separated from it by a mound. This mound forms a bridge from the continent to the island, and extends along its western side, leaving two passages only through it to the harbour of Eunostus, which are bridged over. But this work served not only as a bridge, but as an aqueduct also, when the island was inhabited. Divus Cæsar devastated the island, in his war against the people of Alexandreia, when they espoused the party of the kings. A few sailors live near the tower. The great harbour, in addition to its being well enclosed by the mound and by nature, is of sufficient depth near the shore to allow the largest vessel to anchor near the stairs. It is also divided into several ports. The former kings of Egypt, satisfied with what they possessed, and not desirous of foreign commerce, entertained a dislike to all mariners, especially the Greeks (who, on account of the poverty of their own country, ravaged and coveted the property of other nations), and stationed a guard here, who had orders to keep off all persons who approached. To the guard was assigned as a place of residence the spot called Rhacotis, which is now a part of the city of Alexandreia, situated above the arsenal. At that time, however, it was a village. The country about the village was given up to herdsmen, [CAS. 792] who were also able (from their numbers) to prevent strangers from entering the country.