The valley in which Ojo Caliente lies has been inhabited a long time. The first known inhabitants emigrated from the Four Corners area in the late 1200s. They were a Tewa-speaking people, and they built a number of large pueblos, many of which had 2,000 or more rooms. The one closest to modern-day Ojo Calente is Posi-Ouinge, the 'Greenness Pueblo,' named such because of the green algae that clung to the rocks near the hot spring. The Tewas maintain that its pools provide access to the underworld. Posi-Ouinge was occupied from the 13th through the 16th century, when an epidemic caused the inhabitants to abandon the pueblo and move to Oke-onwi, also known by its Spanish name, San Juan.
https://www.blm.gov/visit/posi-ouinge
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