Astonished, I stood gazing at the spacious dimensions of this time-worn relic of the power of the ancients. It seemed half a castle, half a temple, built of hewn stone, without cement, and ornamented with Corinthian columns. Apparently the place had suffered considerably by the depredations of the Arabs, who, during succeeding centuries, had carried away most of the sculptures; nevertheless, there was much about this relic of a bygone age to excite curiosity, and to cause one to recollect the fact that years before our era the Romans had penetrated as far as that place. That their dominion was not of a mere transitory nature the ruin seemed clearly to show, for it had nearly two thousand years ago been a great castle, and, no doubt, a centre of a departed and forgotten civilisation. Yet to-day this region is unknown to European geographers, and upon both English and French maps of the Great Sahara it is left a wide blank marked “Desert.”

Of Labakan I learnt that it was known to his people as the Hall of the Great Death. According to the Arab legend he related, a Christian ruler called the White Sultan, who lived there ages ago, once made war upon the Sultan of the Tsâd, defeating him, and capturing his daughter, a girl of wondrous beauty. Intoxicated by success, and heavily laden with booty, the White Sultan returned to his own stronghold, followed, however, by the defeated monarch, who travelled alone and in disguise. Attired as a magician, he obtained audience of his enemy, then suddenly threw off his disguise and demanded the return of his daughter. But the White Sultan jeered at him, refused to part with the pearl of his harem, and ordered the sorrowing father to leave his presence, or be consigned to a dungeon. He withdrew, but as he went he cast his ring of graven jacinths upon the ground, and prophesied that ere two moons had run their course, a disaster, terrible and crushing, would fall upon his Infidel foe. Then, retiring to a cavern, he lived as a hermit, and through the months of Choubát and Adâr, for fifty-nine nights and fifty-nine days, he invoked continuously the wrath of the Wrathful upon his enemy. On the sixtieth day his prophecy was fulfilled, for a terrible fire from heaven smote the palace of the White Ruler, and the poisonous fumes from the burning pile spread death and desolation throughout the land. Through the whole of the White Sultan’s broad domains the death-dealing vapours wafted, and the people, the wise men, ministers, and the Sultan himself, all fell victims to the awful visitation. The only person spared an agonising death was the daughter of the Sultan of the Tsâd, who, after the fire was subdued, found the treasure stolen from her father untouched, and carried it back with her to the shores of the Great Lake. Thus was she avenged.

“Since that day,” added the pirate of the desert, “the Hall of the Great Death, with its courtyards and gardens, has been tenantless, the wealthy city that once surrounded it has been swallowed up by the shifting sand, and so completely did Allah sweep away the dogs of Infidels, that even their name is now unknown.”

Much interested in this magnificent monument of the Roman occupation, I left Labakan squatting and smoking in its shadow to wander through the ruins. Upon the centre stone of the arched gateway that gave entrance to the great hall I deciphered the inscription “PBO. AFR. ILL.,” (Provincia Africae illustris.) encircled by a coronal, while below was a trace of a chariot and a person in curious attire following it on foot. Besides a representation of an eagle and a few Berber names roughly graven, I could, however, find no other inscription on the portals, so proceeded to examine the grey walls of the inner courts.

While thus engaged, a stealthy movement behind me caused me to start suddenly, and as I did so, I beheld my enemy!

Silently, with his long, bright knife ready in his hand, he had crept up, and at the very instant I turned he sprang upon me. Ere I could unsheath my poignard, he held my throat in iron grip, and his eyes, flashing like those of some wild animal, were fixed with murderous hatred upon mine.

“Thou art at last in the Hall of the Great Death, which is the Grave of the Infidels, and thou shalt die!” he cried, holding his knife uplifted ready to strike.

I was held to the spot, stricken by a sudden dread.

“So this is how thou treatest the stranger who falleth into thy merciless clutches!” I gasped, scarcely able to articulate, but struggling desperately.

“Thou, dog of hell, art no stranger!” he said, with a string of blasphemies. “Thou hast escaped from our camp and brought upon us disaster, defeat, and dishonour. Thou hast obtained actual possession of the Crescent of Glorious Wonders, and even at this moment there is concealed upon thy person a secret message to the Hadj Mohammed ben Ishak, of Agadez. Confess where thou hast hidden the Crescent, or thou shalt assuredly die!” His knife was poised aloft; his hand trembled, impatient to strike me down. Yet I was powerless in his grasp!