Question: How many conquistadores moved on to the Aztec capital?
About the article "Mexico", section "Conquest (1519)".

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Conquest (1519).
The Spanish conquest of the Aztec Empire began in February 1519 when Hernán Cortés arrived at the port in Veracruz with ca.
500 conquistadores, and later moved on to the Aztec capital.
On his search for gold and other riches, Cortés decided to invade and conquer the Aztec empire.
The ruler of the Aztec empire upon the arrival of the Spaniards was Moctezuma II, who was later killed; his successor and brother Cuitláhuac took control of the Aztec empire, but was among the first to fall from the smallpox epidemic a short time later.
Unintentionally introduced by Spanish conquerors, smallpox ravaged Mesoamerica in the 1520s, killing more than 3 million Aztecs.
Other sources, however, mentioned that the death toll of the Aztecs might have reached up to 15 million (out of a population of less than 30 million).
Severely weakened, the Aztec empire was easily defeated by Cortés and his forces on his second return.
Smallpox was a devastating and selective disease—it generally killed Aztecs but not Spaniards, who as Europeans had already been exposed to it for centuries and were therefore much more immune to it.
The deaths caused by smallpox are believed to have triggered a rapid growth of Christianity in Mexico and the Americas.
At first, the Aztecs believed the epidemic was a punishment from an angry god, but they later accepted their fate and no longer resisted the Spanish rule.
Many of the surviving Aztecs blamed the cause of smallpox to the superiority of the Christian god, which resulted in the acceptance of Catholicism and yielding to the Spanish rule throughout Mexico.
The territory became part of the Spanish Empire under the name of New Spain.
Mexico City was systematically rebuilt by Cortés following the Fall of Tenochtitlan in 1521.
Much of the identity, traditions and architecture of Mexico were created during the colonial period.
Aztec philosophy was the school of philosophy developed by the Aztec Empire.
The Aztecs had a well-developed school of philosophy, perhaps the most developed in the Americas and in many ways comparable to Greek philosophy, even amassing more texts than the ancient Greeks.
Aztec philosophy focused on dualism, monism, and aesthetics, and Aztec philosophers attempted to answer the main Aztec philosophical question of how to gain stability and balance in an ephemeral world. 
Spanish conquistadores led by Hernán Cortez conquered the Aztec capital of Tenochtitlan (on the site of present day Mexico City) in 1521, and Franciscan missionaries followed shortly thereafter.
Sahagún was not in this first group of twelve friars, which arrived in New Spain in 1524.
An account, in both Spanish and Nahúatl, of the disputation that these Franciscan friars held in Tenochtitlan soon after their arrival was made by Sahagún in 1564, in order to provide a model for future missionaries.
Thanks to his own academic and religious reputation, Sahagún was recruited in 1529 to join the missionary effort in New Spain.
He would spend the next 61 years there. 
Taking place in 1521 on the coast of Mexico, a group of Aztecs worships and makes sacrifices to a pair of living Tyrannosaurus rex.
A group of conquistadores led by Hernán Cortés later arrive on the location and venture into the forest to make camp.
One of the Tyrannosaurs crosses the path of one of the conquistadores and devours his horse.
His fellow conquistadores do not believe his story and continue to venture through the dense forest.
An Aztec who is not aware of the Tyrannosaur is eaten, while another witnesses the event with an expression of deep horror and surprise.
Later, the conquistadores try to kill the tribe of Aztecs, but are put to sleep by a hidden Aztec with a tube of tranquilizer darts.
Hernán Cortés surrenders and demands a truce, but realizes they cannot understand him.
He murmurs to himself that they are savages, not realizing the chief can understand English, and is knocked out.
Once he regains consciousness, he meets an English-speaking female Aztec.
She tells him the Aztecs call the Tyrannosaurs "Thunder Lizards".
Later, Hernán Cortés is offered up as a sacrifice, but is freed by his new friend, Gria.
It is revealed that of Hernán's fault, the female, who was the chief's daughter, was consumed by one of the Tyrannosaurs.
The chief becomes enraged, but he does not know that his daughter Ayacoatl is actually alive.
The chief orders a sacrifice of all the conquistadores, but his mind changes when his daughter returns.
The daughter's marriage is postponed when a Tyrannosaur kills an Aztec girl.
The conquistadores set out on a mission to kill the Tyrannosaurs with cannons and muskets.
They succeed in killing the male at the loss of one of their companions.
At night Cortez and his soldiers rob the temple of gold and try to escape to the coast.
They leave lieutenant Rios and sergeant Mendoza to the mercy of the Aztecs as they had become to friendly with them.
In their escape to the coast all but Cortes are devoured by the female Tyrannosaurus.
Sergeant Menoza is mortally wounded by the Tyrannosaurus.
Rios and shaman Xocozin set out to try to kill the animal but Rios has been secretly drugged by Xocozin who tries to kill him.
Xocozin leaves Rios to his fate and heads to the village where he is confronted by the Chief who found out his betrayal.
Xocozin and the Chief fight with the latter being mortally wounded.
Eventually Rios is found by Ayacoatl and Fra Gria, who marries them.
At the altar Xocozin is mortally wounded by Rios.
Ayacoatl then cuts out Xovozin's heart to use as bait for the female Tyrannosaurus who then is killed in a gunpowder explosion.
Fra Gia and Cortes are picked up by a Spanish ship but are warned by Rios not to return to the valley, which Cortes never did when he conquered the Aztec empire.
Fra Gia returned to Spain, became a saint and the inventor of Sangria.
Ayacoatl and Rios become rulers of the tibe. 
By the time of the arrival of the Spanish in Mesoamerica, many of the diverse ethnic civilizations (with the notable exception of the Tlaxcaltecs and the Tarascan Kingdom of Michoacán) were loosely joined under the Aztec empire, the last Nahua civilization to flourish in Central Mexico.
The capital of the empire, Tenochtitlan, became one of the largest urban centers in the world, with an estimated population of 350,000 inhabitants.
During the conquest of the Aztec Empire, the conquistadores, only ten to the millions of indigenous peoples, used the ethnic diversity of the country and exploited the discontentment of the subjugated groups, making important alliances with rivals of the Aztecs.
While the alliances were decisive to their victory, the indigenous peoples were soon subjugated by an equally impressive empire.
Wars and forced labor were accompanied by the spread of European diseases previously unknown in the New World.
Pandemics wrought havoc, killing between 90% and 95% of the pre-contact population according to some estimates.
At first, the colonial system imposed a system of castes, in which the indigenous peoples were marginalized.
Nevertheless, a cultural symbiosis took place: the indigenous peoples adopted and syncretized Roman Catholicism, and a new ethnic group was born: the mestizo, of mixed European and indigenous ancestry.