Ayutthaya Kingdom
Religion

Ayutthaya's main religion was Theravada Buddhism. However, many of the elements of the political and social system were incorporated from Hindu scriptures and were conducted by Brahmin priests. Many areas of the kingdom also practiced Mahayana Buddhism, Islam and, influenced by French Missionaries who arrived through China in the 17th century, some small areas converted to Roman Catholicism. The influence of Mahayana and Tantric practices also entered Theravada Buddhism, producing a tradition called Tantric Theravada.

The natural world was also home to a number of spirits which are part of the Satsana Phi. Phi (Thai: ผี) are spirits of buildings or territories, natural places, or phenomena; they are also ancestral spirits that protect people, or can also include malevolent spirits. The phi which are guardian deities of places, or towns are celebrated at festivals with communal gatherings and offerings of food. The spirits run throughout Thai folklore.

Phi were believed to influence natural phenomena including human illness and thus the baci became an important part of people identity and religious health over the millennia. Spirit houses were an important folk custom which were used to ensure balance with the natural and supernatural world. Astrology was also a vital part to understanding the natural and spiritual worlds and became an important cultural means to enforce social taboos and customs.
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