influence. The city continued to grow during the Post Classic period (900-1521) as well, although there was another regime change. Toltec-Chichimecas from the fall the Tula arrived in the 12th century as refugees. The ruling Olmeca-Xicallanca allowed their arrival but oppressed them, until the Toltec-Chichimecas revolted and took over in the 13th century. The new lords called themselves the Choloteca, but they did not eliminate the Olmeca-Xicallanca. The defeated group was pushed to the eastern half of the city with the new rulers living on the San Pedro side and constructing a new religious center, the Quetzalcoatl Temple to replace the Pyramid. This is the origin of the division of the city. By the time the Spanish arrived, Cholula was actually divided into three sub entities, roughly corresponding to the municipalities of San Pedro Cholula, San Andrés Cholula and Santa Isabel Cholula. However, only the first two are considered to be part of the modern city of Cholula. San Pedro is defined by the main plaza of the city west of the Great Pyramid and area west of that. The city was important as a mercantile crossroads and a religious center, although religious practice was centered on the Quetzalcoatl Temple in San Pedro rather than on the Pyramid, which was overgrown. Hernán Cortés noted he could see about 2,000 houses in the city with as many temples as days of the year. It had a population of about 100,000; however, the area was overpopulated leading to chronic hunger among the poor. During the Conquest, the Spanish would kill about 6,000 residents of the city in an event known as the Cholula Massacre. It is from this episode that the 365 churches legend evolves. The two parts of town were divided into encomiendas for a very short time, but in 1537 the entirety would be declared a city by the Spanish Crown, receiving its coat of arms in 1540. However, there is evidence that the division of the city was recognized since the early colonial period. The Franciscans established themselves in San Pedro first, with the San Gabriel monastery because this was the power center of the city and at first the monks were not sufficient to be spread out around the entire city. This early emphasis on the San Pedro side, along with the settling of the Spanish population almost exclusively here, resulted in this side of the city becoming