A kiva (also estufaJohn Peabody Harrington, The Ethnogeography of the Tewa Indians - p.306, 1916) is a space used by Puebloans for rites and political meetings, many of them associated with the kachina belief system. Among the modern Hopi and most other Pueblo peoples, "kiva" means a large room that is circular and underground, and used for spiritual ceremony and a place of worship.
Similar subterranean rooms are found among ruins in the Southwestern United States, indicating uses by the ancient peoples of the region including the ancestral Puebloans, the Mogollon culture, and the Hohokam. Those used by the ancient Pueblos of the Pueblo I Period and following, designated by the Pecos Classification system developed by archaeologists, were usually round and evolved from simpler pit-houses. For the Ancestral Puebloans, these rooms are believed to have had a variety of functions, including domestic residence along with social and ceremonial purposes.
When designating an ancient room as a kiva, archaeologists make assumptions about the room's original functions and how those functions may be similar to or differ from those used in modern practice. The kachina belief system appears to have emerged in the pre-Columbian Southwest around 1250, while kiva-like structures occurred much earlier. This suggests that the room's older functions may have been changed or adapted to suit the new religious practice.
As cultural changes occurred, particularly during the Pueblo III Period between 1150 and 1300, kivas had a prominent place in the community. However, some kivas were built above ground. Kiva architecture became more elaborate, with tower and great kivas incorporating specialized floor features. For example, kivas in Mesa Verde National Park were generally keyhole-shaped. Finding one kiva for each five or six rooms was normal in most larger communities. Kiva destruction, primarily by burning, has been seen as a strong archaeological indicator of conflict and warfare during this period.
Fifteen top rooms encircle the central chamber of the vast Great Kiva at Aztec Ruins National Monument.
After 1325 or 1350, except in the Hopi and Pueblo region, the ratio changed from 60 to 90 rooms for each kiva. This may indicate a religious or organizational change within the society, perhaps affecting the status and number of clans among the Pueblo people.
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