By the trade [in these aromatics] both the Sabæans and the Gerrhæi have become the richest of all the tribes, and possess a great quantity of wrought articles in gold and silver, [CAS. 778] as couches, tripods, basins, drinking-vessels, to which we must add the costly magnificence of their houses; for the doors, walls, and roofs are variegated with inlaid ivory, gold, silver, and precious stones. This is the account of Artemidorus.[780] The rest of the description is partly similar to that of Eratosthenes, and partly derived from other historians. 20. Some of these say, that the sea is red from the colour arising from reflection either from the sun, which is vertical, or from the mountains, which are red by being scorched with intense heat; for the colour, it is supposed, may be produced by both these causes. Ctesias of Cnidus speaks of a spring which discharges into the sea a red and ochrous water. Agatharchides, his fellow-citizen, relates, on the authority of a person of the name of Boxus, of Persian descent, that when a troop of horses was driven by a lioness in heat as far as the sea, and had passed over to an island, a Persian of the name of Erythras constructed a raft, and was the first person who crossed the sea to it; perceiving the island to be well adapted for inhabitants, he drove the herd back to Persia, and sent out colonists both to this and the other islands and to the coast. He [thus] gave his own name to the sea. But according to others, it was Erythras the son of Perseus who was the king of this country. According to some writers, from the straits in the Arabian Gulf to the extremity of the cinnamon country is a distance of 5000 stadia,[781] without distinguishing whether (the direction is) to the south or to the east. It is said also that the emerald and the beryl are found in the gold mines. According to Poseidonius, an odoriferous salt is found in Arabia. 21. The Nabatæans and Sabæans, situated above Syria, are the first people who occupy Arabia Felix. They were frequently in the habit of overrunning this country before the Romans became masters of it, but at present both they and the Syrians are subject to the Romans. The capital of the Nabatæans is called Petra. It is situated on a spot which is surrounded and fortified by a smooth and level rock (petra), which externally is abrupt and precipitous, but within there are abundant springs of water both for domestic purposes and for watering gardens. Beyond the enclosure the country is for the most part a desert, particularly towards Judæa. Through this is the shortest road to Jericho, a journey of three or four days, and five days to the Phœnicon (or palm plantation). It is always governed by a king of the royal race. The king has a minister who is one of the Companions, and is called Brother. It has excellent laws for the administration of public affairs.