Each calpulli (from Classical Nahuatl calpōlli, Nahuatl pronunciation: [kaɬˈpoːlːi], meaning "large house") had its own tiyanquiztli (marketplace), but there was also a main marketplace in Tlatelolco – Tenochtitlan's sister city. Cortés estimated it was twice the size of the city of Salamanca with about 60,000 people trading daily. Bernardino de Sahagún provides a more conservative population estimate of 20,000 on ordinary days and 40,000 on feast days. There were also specialized markets in the other central Mexican cities.