the great palace complexes that made up the city. Adding even more complexity to Aztec social stratification was the . is a group of families related by either kinship or proximity. These groups consist of both elite members of Aztec society and commoners. Elites provided commoners with arable land and nonagricultural occupations, and commoners performed services for chiefs and gave tribute. History Tenochtitlan was the capital of the Mexican civilization of the Mexica people, founded in 1325. The state religion of the Mexica civilization awaited the fulfillment of an ancient prophecy: the wandering tribes would find the destined site for a great city whose location would be signaled by an eagle with a snake in its beak perched atop a cactus (Opuntia), which had grown from the heart of Copil. The Mexica saw this vision on what was then a small swampy island in Lake , a vision that is now immortalized in Mexico's coat of arms and on the Mexican flag. Not deterred by the unfavourable terrain, they set about building their city, using the system (misnamed as "floating gardens") for agriculture and to dry and expand the island. A thriving culture developed, and the Mexica civilization came to dominate other tribes around Mexico. The small natural island was perpetually enlarged as grew to become the largest and most powerful city in Mesoamerica. Commercial routes were developed that brought goods from places as far as the Gulf of Mexico, the Pacific Ocean and perhaps even the Inca Empire. After a flood of Lake Texcoco, the city was rebuilt during the rule of , which was between 1486-1502, in a style that made it one of the grandest ever in Mesoamerica. Spanish conquistador Hernán Cortés arrived in Tenochtitlan on 8 November 1519. Although there are not precise numbers, the city's population has been estimated at between 200,000 and 400,000 inhabitants, placing Tenochtitlan among the largest cities in the world at that time. Compared to the cities of Europe, only Paris, Venice and Constantinople might have rivaled it. It was five times the size of the London of Henry VIII. In a letter to the Spanish king, Cortés wrote that was as large as Seville or Córdoba. Cortes' men were in awe at the sight of the splendid city and many wondered if they were dreaming. Although some popular sources put the number as high as 350,000, the most common estimates