In 1373, during the war between Ferdinand I of Portugal and Henry II of Castile, Nuno Gonçalves de Faria, the alcaide of the Castle of Faria, left his son Gonçalo Nunes in charge of the castle while he joined the Portuguese troups. Gonçalves de Faria was captured in battle and, fearing Gonçalo Nunes would give the castle in exchange for his father’s life, devised a plan to save the castle.
Nuno Gonçalves convinced the Castilians to lead him to outside the castle’s walls, promising them he would be able to persuade his son to surrender. But once there, he instead exhorted his son to never surrender, stating that he would curse Gonçalo Nunes unless the Castilians entered the castle over Gonçalo’s dead body. Hearing this, the Castilians killed Nuno Gonçalves de Faria on the spot, in front of his son. Gonçalo followed his father’s wish, and never surrendered the castle. The ruins of it still exist today, near Barcelos, in the north of Portugal.
The stamps were designed by the Post Office Art Department, lithographed by the Mint on glazed paper sheets of 10×10 stamps with perforation 13½, and circulated from 19 December 1973 to 31 December 1983.