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Cortés welcomed by Moctezuma

Upon meeting, Hernan Cortés claimed to be the representative of the queen, Doña Juana of Castile, and her son, King Carlos I of Castile and Holy Roman Emperor Charles V, all Spanish royalty, had then made an appearance. Sahagún reports that Moctezuma welcomed Cortés to Tenochtitlan on the Great Causeway, Xolac. "The chiefs who accompanied Moctezuma were: Cacamatzin, king of Tetzcoco; Tetlepanquetzaltin, king of Tlacopan, Itzcuauhtzin the Tlacochcalcatl, lord of Tlatelolco; and Topantemoc, Motechzoma's treasurer in Tlatelolco." Moctezuma and his chiefs were adorned with blazing gold on their shoulders with feathers and jewels. On the causeway where the two groups met, enormous numbers of people from Tenochtitlan watched the exchange.

Moctezuma went to greet Cortés with his brother, Cuitláhuac, and his nephew, Cacamatzin. Cortés strode ahead of his commanders and attempted to embrace Moctezuma, but was restrained by Cuitlahuac and Cacamatzin. Cortés was not permitted to touch the emperor; no one was allowed.

After greetings, Moctezuma personally dressed only Cortés in a priceless feather-work flower, a golden jewelry studded necklace and a garland of flowers. Moctezuma then brought Cortés to the shrine of the goddess Toci, where he gave him a more private greeting, in which he practically gave the Aztec Empire to Cortés, as he reportedly said that it was his "desire to serve."

A fragment of the greetings of Moctezuma says: "My lord, you have become fatigued, you have become tired: to the land you have arrived. You have come to your city: Mexico, here you have come to sit on your place, on your throne. Oh, it has been reserved to you for a small time, it was conserved by those who have gone, your substitutes... This is what has been told by our rulers, those of whom governed this city, ruled this city. That you would come to ask for your throne, your place, that you would come here. Come to the land, come and rest: take possession of your royal houses, give food to your body."

Moctezuma had the royal palace of Axayácatl, Moctezuma's father, prepared for Cortés. On the same day that the Spanish expedition and their allies entered Tenochtitlan, Moctezuma came to visit Cortés and his men. What happened in this second meeting remains controversial. According to several Spanish versions, some written years or decades later, Moctezuma first repeated his earlier, flowery welcome to Cortés on the Great Causeway, but then went on to explain his view of what the Spanish expedition represented in terms of Aztec tradition and lore, including the idea that Cortés and his men (pale, bearded men from the east) were the return of characters from Aztec legend. At the end of this explanation, the Emperor pledged his loyalty to the King of Spain and accepted Cortés as the King's representative. According to Diaz, Moctezuma said to Cortés, "As for your great King, I am in his debt and will give him of what I possess."

While in the Axayacatl palace, the conquistadors discovered the secret room where Moctezuma kept the treasure he had inherited from his father. The treasure consisted of a "quantity of golden objects – jewels and plates and ingots". Diaz noted, "The sight of all that wealth dumbfounded me."

Cortés later asked Moctezuma to allow him to erect a cross and an image of Virgin Mary next to the two large idols of Huichilobos and Tezcatlipoca, after climbing the one hundred and fourteen steps to the top of the main temple pyramid, a central place for religious authority. Moctezuma and his papas were furious at the suggestion, with Moctezuma claiming his idols, "give us health and rain and crops and weather, and all the victories we desire."

After Cortés' request surrounding the questioning of raising the cross and the image of the Virgin Mary, the Mexica then killed seven Spanish soldiers Cortés had left on the coast, including Cortés' Villa Rica Constable Juan de Escalante, and many Totonacs. Cortés along with five of his captains and Doña Marina and Aguilar, convinced Moctezuma to "come quietly with us to our quarters, and make no protest... if you cry out, or raise any commotion, you will immediately be killed." Moctezuma was later implicated by Qualpopoca and his captains, who had killed the Spanish soldiers. Though these captains of Moctezuma were sentenced to be "burned to death", Moctezuma continued to remain a prisoner, fearing a "rebellion in his city" or that the Spanish may "try to set up another prince in his place." This, despite Moctezuma's chieftains, nephews and relations suggesting they should attack the Spanish.

As of 14 November 1519, Moctezuma was Cortés' prisoner as insurance against any further resistance, until the end of May 1520, Moctezuma lived with Cortés in the palace of Axayácatl.

However, Moctezuma continued to act as Emperor, subject to Cortés' overall control. During the period of his imprisonment, Moctezuma stated "he was glad to be a prisoner, since either our gods gave us power to confine him or Huichilobos permitted it." He would even play the game of totoloque with Cortés. After the treason of Cacamatzin, Moctezuma and his caciques, were forced to take a more formal oath of allegiance to the King of Spain, though Moctezuma "could not restrain his tears". Moctezuma told his caciques that "their ancestral tradition, set down in their books of records, that men would come from the direction of the sunrise to rule these lands" and that "He believed... we were these men."

Cortés sent expeditions to investigate the Aztec sources of gold in the provinces of Zacatula, Tuxtepec, and the land of the Chinantec. Moctezuma was then made to pay a tribute to the Spanish King, which included his father's treasure. These treasures, the Spaniards melted down to form gold bars stamped with an iron die. Finally, Moctezuma let the Catholic conquistadors build an altar on their temple, next to the Aztec idols.

Finally, the Aztec gods allegedly told the Mexican papas, or priests, they would not stay unless the Spaniards were killed and driven back across the sea. Moctezuma warned Cortés to leave at once, as their lives were at risk. Many of the nobility rallied around Cuitláhuac, the brother of Moctezuma and his heir-apparent; however, most of them could take no overt action against the Spanish unless the order was given by the Emperor.