In 1679, he would have been “more or less” 70 years old, as his contemporaries would have put it. He was at the end of his life. It is when the entail was founded, the main asset of which was the chapel dedicated to Nossa Senhora da Guadalupe (Our Lady of Guadalupe) in Aldeia de Cima, on the outskirts of Armamar. The church was already standing and masses being celebrated. It was there that Domingos Cardoso da Fonseca wished to be buried. Although he had suggested that, on his death, the chapel administration should fall to his legitimate son, Manuel Cardoso Madeira, the final decision was left to his written will (ANTT, Morgados e capelas, Núcleo Antigo 187, fl. 5-15).
Domingos da Fonseca displays not only concerns of a spiritual nature, which were common to this type of foundation, but also a wish to perpetuate the memory of his surname, family and offspring. For example, he wished his successors used the surname Madeira, after Domingos Madeira, his father. He also demonstrated to be profoundly knowledgeable of the legal practices of his time. Not only did he order a tombo to be written up, he also detailed that it should open with the transcript, in notarial public form, of the institution deed (made by a notary public), with two authenticated copies being sent to the Torre do Tombo, in Lisbon, and to the cathedral of Lamego registry, respectively. Furthermore, he advised the administrator to keep certificates of those documents, along with his own copy (ANTT, Morgados e capelas, Núcleo Antigo 187, fl. 11-11v). Not a very common concern, registration at the Torre do Tombo (by filing a copy of the institution) indicates legal knowledge and an awareness of the importance of preserving the foundation charter.