The space now occupied by the Library was adapted in the middle of the 20th century by D. Francisco de Albuquerque, becoming a symbol of the dedication to letters and the acquisition of knowledge that was the hallmark of successive representatives of the House of Mateus.

This room, which occupies the centre of the north wing of the House, houses many of the books of a family that has always had a strong presence in the University, the Church and the Judiciary (...) and with concerns for culture, at least book culture, as Vasco Graça Moura's recent study has shown.

A must-see for both tourists and participants in the Foundation's cultural activities, the Library houses more than 6,000 volumes, 459 of which are old books.