Yohualtecatl.

the name of a mountain near the site of the shrine to Guadalupe; it was also called Mount Yoaltecatl; it was a site where child sacrifices (called "human banners," or tlacatetehuitl) were made to the rain deities

Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 2 -- The Ceremonies, No. 14, Part III, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1951), 43.