Subsequently, Fernán Pérez acted as a great lord, and it is likely that he was a knight at this time, probably having been knighted between 1369 and 1371. He began constructing the
Castle of Nogueirosa, confronting the prior of the monastery of Sobrado to whom the lands surrounding the castle belonged. Fernán Pérez acted without scruples, inspiring gear according to the chronicles, and letting his violent character show. He permanently abandoned the pre-existing family castle to rule his domain from the new Castle of Nogueirosa. The wars had not ended
in Galicia. After Henry (
Henry II of Castile) rose to the throne, several "petristas", or knights favouring Peter, offered the throne to
Fernando de Portugal. The old petrista
Fernando Ruiz de Castro is reported as the instigator behind this, as his enmity towards Henry continued even after Peter's death. Henry, hearing of these maneuvers, returned to Galicia with
Bertrand du Guesclin and other knights, Fernán Pérez de Andrade among them. Together, they forced Don Fernando back to Portugal. The brother of Fernán Pérez,
Nuño Freyre, who was Master of the
Order of Christ supported the cause of the Portuguese, so on being defeated had to leave Galicia. The war ended between 1371 and 1373 with several treaties in which Fernando Ruíz de Castro was exhorted to exile in
Baiona. During this period, Fernán Pérez received several more grants of land, and became lord of the villages of
Ferrol,
Pontedeume, and Vilalba, with rights over those villages that until then only were for the king himself. Fernán Pérez was the right-hand man of King Henry in Galicia, to the point that he was appointed to make all the preparations for the wedding of Henry's son, Fadrique with
Beatrice of Portugal. In 1371, he was appointed Governor of
A Coruña. In 1384, he took part in the dynastic clash between
John I of Castile and
John I of Portugal. In 1386 he fought
John of Gaunt, Duke of Lancaster in a new dynastic war in
Castile and he defended A Coruña, although it is unclear whether he defended the city or turned it over to John of Gaunt. The war ended with the marriage of Catalina, daughter of the Duke of Lancaster and granddaughter of
Peter I of Castile, Peter the Cruel to Henry (to be
Henry III), and Fernán Pérez regained control of A Coruña. Fernan reached his "social zenith" around 1391 when after his first wife's death, he had already remarried
Constanza Moscoso, of an important family of Galician knights, which helped bolster his good social standing. Fernán Pérez de Andrade held several royal commissions in public office until the end of his life, and left behind a bigger patrimony than that received from his ancestors, placing his lineage as one of the most prominent of the Galician landscape. ==Some works==