The Parish Church of Barcelos, dedicated to Santa María Mayor, is a monument that maintains its medieval robustness in appearance, embellished by decorative and architectural elements that reveal the imposition of the Gothic style on a Romanesque structure. Its construction began in the second half of the 14th century at the initiative of D. Pedro, the 3rd Count of Barcelos, whose coat of arms is engraved on the archivolts of the main portal. Inside, the historic Romanesque capitals affirm the medieval atmosphere, contrasting with the 1721 tile panels that depict scenes from the life of Our Lady. In the various side chapels, the Baroque decoration stands out, particularly the gilded altars. In the main chapel, there are preserved Mannerist paintings representing the Annunciation and the Adoration of the Shepherds. The church is one of the greatest exponents of Romanesque architecture in the north of the country and underwent significant transformations throughout the 15th to 18th centuries. In the 20th century, the rose window was restored, and on the south side of the façade, there is a bell tower dating from the 18th century. It has been classified as a National Monument since 1927.