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Oeiras is a city in Piauí.
The town grew around a chapel dedicated to Our Lady of Victories established in 1695. The town was the capital of Piauí between 1759 and 1851.
Oeiras is a centre of religious pilgrimage and is best visited around Easter, or one of the other major religious festivals observed in the city. At other times, Oeiras is a pleasant, sleepy town.