<P> Cortés needed to gain other new allies as well . If the Spaniards were able to prove they could protect their new allies from the possibility of Aztec retribution, changing sides would not be too difficult for other tributaries . After Cortés' forces managed to defeat the smaller armies of some Aztec tributary states, Tepeyac, and later, Yauhtepec and Cuauhnahuac were easily won over . Cortés also used political maneuvering to assure the allegiance of other states, such as Tetzcoco . In addition, Cortés replaced kings with those who he knew would be loyal to him . Cortés now controlled many major towns, which simultaneously bolstered Cortés's forces while weakening the Aztecs . </P> <P> Though the largest group of indigenous allies were Tlaxcalans, the Huexotzinco, Atlixco, Tliliuhqui - Tepecs, Tetzcocans, Chalca, Alcohua and Tepanecs were all important allies as well, and had all been previously subjugated by the Aztecs . </P> <P> Even the former Triple Alliance member, city of Tetzcoco (or Texcoco) became a Spanish ally . As the rebellion attempt led by the Tetzcocan Tlatoani, Cacamatzin in times of Moctezuma's reclusion was conjured by the Spanish, Cortés named one of Cacamatzin's brothers as new tlatoani . He was Ixtlilxóchitl II, who had disagreed with his brother and always proved friendly to the Spanish . Later, Cortés also occupied the city as base for the construction of brigantines . However, one faction of Tetzcocan warriors remained loyal to the Aztecs . </P> <P> Cortés had to put down internal struggles among the Spanish troops as well . The remaining Spanish soldiers were somewhat divided; many wanted nothing more than to go home, or at the very least to return to Vera Cruz and wait for reinforcements . Cortés hurriedly quashed this faction, determined to finish what he had started . Not only had he staked everything he had or could borrow on this enterprise, he had completely compromised himself by defying his superior Velázquez . He knew that in defeat he would be considered a traitor to Spain, but that in success he would be its hero . So he argued, cajoled, bullied and coerced his troops, and they began preparing for the siege of Mexico . In this Cortés showed skill at exploiting the divisions within and between the Aztec states while hiding those of his own troops . </P>

Who was the last king of the aztec empire that surrendered to the spanish