The identification of de Contreiras as the Master of Saint Quentin was determined by Martin Soria (1957) and later reinforced by Vítor Serrão.
[1] His first recorded works were decorations for the triumphal entry of King Manuel I and his wife Eleanor of Austria into Lisbon in 1521.
His work was part of 429 flags painted by Portuguese painters of the time (including Álvaro Pires, Diogo Gonçalo, Martins Fernandes and Fernão de Oliveira), paid for by the Lisbon Chamber of Commerce.
This work includes "the Preaching of Saint John the Baptist" which is now held in the Portuguese Museum of Ancient Art.
[13] In 1556, he painted the Triptych of the Conception, Birth and Childhood of the Virgin, also for the convent of São Bento de Castris.
[14] The last reference to de Contreiras is that he was again examiner of Lisbon painters, this time with João Guterres and Gaspar Dias.