Suddenly the troops came upon what seemed the environs of a populous city, which, as they entered it, appeared to surpass even that of Cempoalla in the size and solidity of its structures.[86] These were of stone and lime, many of them spacious and tolerably high. There were thirteen _teocallis_ in the place; and in the suburbs they had seen a receptacle, in which, according to Bernal Diaz, were stored a hundred thousand skulls of human victims, all piled and ranged in order! He reports the number as one he had ascertained by counting them himself.[87] Whatever faith we may attach to the precise accuracy of his figures, the result is almost equally startling. The Spaniards were destined to become familiar with this appalling spectacle as they approached nearer to the Aztec capital. The lord of the town ruled over twenty thousand vassals. He was tributary to Montezuma, and a strong Mexican garrison was quartered in the place. He had probably been advised of the approach of the Spaniards, and doubted how far it would be welcome to his sovereign. At all events, he gave them a cold reception, the more unpalatable after the extraordinary sufferings of the last few days. To the inquiry of Cortés, whether he were subject to Montezuma, he answered, with real or affected surprise, “Who is there that is not a vassal of Montezuma?”[88] The general told him, with some emphasis, that _he_ was not. He then explained whence and why he came, assuring him that he served a monarch who had princes for his vassals as powerful as the Aztec monarch himself.