'Ayutthaya' (also spelled 'Ayudhya' or 'Ayuthia') may refer to:
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Ayutthaya (city), in Thailand, founded in 1350, the capital of
Ayutthaya Province
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Ayutthaya Kingdom, a Thai kingdom that existed from 1350 to 1767
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Ayutthaya historical park, the ruins of the old city
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Bank of Ayudhya, the fifth largest commercial bank in Thailand
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Milky cicada, ''Ayuthia spectabilis''