The Nahuatl word "xihuitl" means "year" as well as "turquoise" and "fire", and Xiuhtecuhtli was also the god of the year and of time. The Lord of the Year concept came from the Aztec belief that Xiuhtecuhtli was the North Star. In the 260-day ritual calendar, the deity was the patron of the day "Atl" ("Water") and with the trecena 1 Coatl ("1 Snake"). Xiuhtecuhtli was also one of the nine Lords of the Night and ruled the first hour of the night, named "Cipactli" ("Alligator"). Scholars have long emphasized that this fire deity also has aquatic qualities. Xiuhtecuhtli dwelt inside an enclosure of turquoise stones, fortifying himself with turquoise bird water. He is the god of fire in relation to the cardinal directions, just as the brazier for lighting fire is the center of the house or temple. Xiuhtecuhtli was the patron god of the Aztec emperors, who were regarded as his living embodiment at their enthronement. The deity was also one of the patron gods of the "pochteca" merchant class.