Some one was to be sent out, therefore, who should possess, in some sort, a controlling, or, at least, concurrent power with the dangerous chief, while ostensibly he should act only in subordination to him. The person selected for this delicate mission, was the Licentiate Vaca de Castro, a member of the Royal Audience of Valladolid. He was a learned judge, a man of integrity and wisdom, and, though not bred to arms, had so much address, and such knowledge of character, as would enable him readily to turn the resources of others to his own account.

His commission was guarded in a way which showed the embarrassment of the government. He was to appear before Pizarro in the capacity of a royal judge; to consult with him on the redress of grievances, especially with reference to the unfortunate natives; to concert measures for the prevention of future evils; and above all, to possess himself faithfully of the condition of the country in all its details, and to transmit intelligence of it to the Court of Castile. But, in case of Pizarro's death, he was to produce his warrant as royal governor, and as such to claim the obedience of the authorities throughout the land.--Events showed the wisdom of providing for this latter contingency.21The licentiate, thus commissioned, quilted his quiet residence at Valladolid, embarked at Seville, in the autumn of 1540, and, after a tedious voyage across the Atlantic, he traversed the Isthmus, and, encountering a succession of tempests on the Pacific, that had nearly sent his frail bark to the bottom, put in with her, a mere wreck, at the northerly port of Buenaventura.22 The affairs of the country were in a state to require his presence.