The Acolhua are a Mesoamerican people who arrived in the Valley of Mexico in or around the year 1200 CE. The Acolhua were a sister culture of the Aztecs (or Mexica) as well as the Tepanec, Chalca, Xochimilca and others. It is likely that the ruling family of the Acolhua were descended from Otomi speakers and did not speak Nahuatl until decreed by their ruler (tlatoani) Techotlalatzin. Under Techotlalatzin's grandson, Nezahualcoyotl, the Acolhua allied with the Mexica (Aztecs) in the Aztec Triple Alliance. The Acolhua capital, Texcoco, became a cultural center of the resultant Aztec Empire.