But it was in the west that a power was growing destined to throw down the kings of Aquilonia from their high places. In the north there was incessant bickering along the Cimmerian borders between the black-haired warriors and the Nordheimir; and the Æsir, between wars with the Vanir, assailed Hyperborea and pushed back the frontier, destroying city after city. The Cimmerians also fought the Picts and Bossonians impartially, and several times raided into Aquilonia itself, but their wars were less invasions than mere plundering forays. But the Picts were growing amazingly in population and power. By a strange twist of fate, it was largely due to the efforts of one man, and he an alien, that they set their feet upon the ways that led to eventual empire. This man was Arus, a Nemedian priest, a natural-born reformer. What turned his mind toward the Picts is not certain, but this much is history--he determined to go into the western wilderness and modify the rude ways of the heathen by the introduction of the gentle worship of Mitra. He was not daunted by the grisly tales of what had happened to traders and explorers before him, and by some whim of fate he came among the people he sought, alone and unarmed, and was not instantly speared. The Picts had benefited by contact with Hyborian civilization, but they had always fiercely resisted that contact. That is to say, they had learned to work crudely in copper and tin, which were found scantily in their country, and for which latter metal they raided into the mountains of Zingara, or traded hides, whale's teeth, walrus tusks and such few things as savages have to trade. They no longer lived in caves and tree-shelters, but built tents of hides, and crude huts, copied from those of the Bossonians. They still lived mainly by the chase, since their wilds swarmed with game of all sorts, and the rivers and sea with fish, but they had learned how to plant grain, which they did sketchily, preferring to steal it from their neighbors the Bossonians and Zingarans. They dwelt in clans which were generally at feud with each other, and their simple customs were blood-thirsty and utterly inexplicable to a civilized man, such as Arus of Nemedia. They had no direct contact with the Hyborians, since the Bossonians acted as a buffer between them. But Arus maintained that they were capable of progress, and events proved the truth of his assertion--though scarcely in the way he meant.