Sao Mateus Fair Viseu in Viseu
The Feira de São Mateus in Viseu traces its origin to a royal charter granted by King João I in 1392, making it the oldest continuously running fair on the Iberian Peninsula. Now spanning roughly a month from early August into September, it combines music, folklore, crafts and gastronomy across a dedicated fairground in the city.
On the tenth of January 1392, King João I granted Viseu a Carta de Feira, a formal charter establishing an annual free trading fair to begin each year on the feast of Santa Cruz and run for a full month.