The barons of Elephantine bore the proud title of "Keepers of the Door of the South," and, in addition, they display, seemingly just as proudly, the title "Caravan Conductors." In those days it was no easy task to lead a caravan through the Soudan, and bring it back safe with its precious load through all the wild and savage tribes who inhabited the land of Nubia. More than one of the barons of Elephantine set out with a caravan never to return, but to leave his bones, and those of his companions, to whiten among the desert sands; and one of them has told us how, hearing that his father had been killed on one of these adventurous journeys, he mustered his retainers, marched south with a train of a hundred asses, punished the tribe which had been guilty of the deed, and brought his father's body home, to be buried with all due honours. Some of the records of these early journeys, the first attempts to explore the interior of Africa, may still be read, carved on the walls of the tombs where the brave explorers sleep. One baron, called Herkhuf, has told us of no fewer than four separate expeditions which he made into the Soudan. On his first journey, as he was still young, he went in company with his father, and was away for seven months. The next time he was allowed to go alone, and brought back his caravan safely after an absence of eight months. On his third journey he went farther than before, and gathered so large a quantity of ivory and gold-dust that three hundred asses were required to bring his treasure home. So rich a caravan was a tempting prize for the wild tribes on the way; but Herkhuf persuaded one of the Soudanese chiefs to furnish him with a large escort, and the caravan was so strongly guarded that the other tribes did not venture to attack it, but were glad to help its leader with guides and gifts of cattle. Herkhuf brought his treasures safely back to Egypt, and the King was so pleased with his success that he sent a special messenger with a boat full of delicacies to refresh the weary traveller. [Illustration: PLATE 12. A DESERT POSTMAN.] But the most successful of all his expeditions was the fourth. The King who had sent him on the other journeys had died, and was succeeded by a little boy called Pepy, who was only about six years old when he came to the throne, and who reigned for more than ninety years--the longest reign in the world's history. In the second year of Pepy's reign, the bold Herkhuf set out again for the Soudan, and this time, along with other treasures, he brought back something that his boy-King valued far more than gold or ivory.