Entail foundation deed by Luís Álvares de Madureira, fidalgo da casa do rei, his wife and first-cousin Joana de Madureira, and his aunt Isabel de Madureira. Together they decided to establish an entail, using their farmstead of Freixo, in Guilhabreu, as the head of the entail. They decided to create the entail in order to avoid the division of the estates and the dilution of the memory of the lineage, arguing that the concentration of the inheritance in one institution, managed by the first-born, was also a way of supporting the other relatives. At that time, the couple had no children and decided that in the absence of descendants, the surviving member of the couple had the power to appoint the successor. However, the administrator of the entail should primarly be the first-born son, excluding clerics and those who commited lese-majeste crimes. The administrators were also required to entail other lands and to use the Madureira name and coat of arms. An inventory of the entail was to be made, with three copies: one to be kept by the administrator, and the others to be kept in the Municipality of Porto and in the Cathedral.