early Portuguese explorer of Africa, who established relations between Portugal and Ethiopia.

As a boy, Pêro served the duke of Medina-Sidonia in Sevilla (Seville) for six or seven years, returning to Portugal with the duke's brother late in 1474 or early in 1475, when he passed into the service of King Afonso V, first as a junior squire and then as squire, serving with horse and arms. He accompanied the king when he claimed the Castilian throne and was proclaimed at Plasencia, and he was present at the Battle of Toro. He also escorted the king on a fruitless journey to France to seek aid from Louis XI. On Afonso's death, Pêro served his son John II as a squire of the royal guard and was employed as a confidential messenger to Spain. He was sent on two missions to North Africa, one, in the guise of a merchant, to seek the friendship of the ruler of Tlemcen, and the other to Fez to buy horses for Dom Manuel, later king (as Manuel I).

John II hoped to profit from the spice trade of India and to make contact with the Christian ruler of Abyssinia (Ethiopia), identified with the semimythical Prester John. Abyssinians had already visited Rome and even the Iberian Peninsula. John had sent Diogo Cão (Cão, Diogo) (Diogo Cam) down the west coast of Africa, and he had discovered the Congo and sailed beyond, but his belief that he had reached or was about to reach the cape proved unfounded. John then ordered Bartolomeu Dias to pursue Cão's explorations. He also decided to send travelers by land to report on the location and trade of India and Abyssinia. This move may have resulted from reports received in 1486 in Benin (a kingdom on the west coast of Africa), referring to a great ruler far to the east. Pêro was chosen for the mission to India, and Afonso de Paiva, a squire who spoke Arabic, was to seek Prester John and discover a route from Guinea to Abyssinia. The men left Portugal in May 1487 with letters of credit on Italian bankers; they reached Barcelona and sailed to Naples and Rhodes, where they assumed the guise of honey merchants and sailed to Alexandria. They became ill, and their wares were seized, but they bought other goods and went to Cairo, joining a group of North Africans traveling to Aden. There they separated, Pêro going to India, reaching Cannanore, Calicut, and Goa. He then returned to Ormuz, in Persia, sometime between October 1489 and March 1490. Meanwhile, Afonso de Paiva had reached Abyssinia. The two had proposed to meet at Cairo. Pêro arrived there about the end of 1490 or early 1491 and received news of his companion's death. Meanwhile, John II had sent two messengers to Cairo to instruct Pêro to return when the mission was completed. Pêro wrote a letter to John about his experiences and continued on to Abyssinia. One of the messengers accompanied him to Ormuz, where they separated. Pêro made his way to the Red Sea. Disguised as a Muslim, he visited Mecca and Medina. He also saw Mount Sinai, reaching Zeila in 1492 or 1493, whence he passed by caravan to Abyssinia, where he was destined to spend the rest of his life.

Pêro was received by the Abyssinian ruler, Emperor Eskender, and was well treated and made governor of a district. He was not, however, allowed to leave the country. Some years later the Abyssinian regent, Queen Helena, sent an Armenian named Matthew to Portugal. He reached Afonso de Albuquerque at Goa in 1512 and was in Portugal in 1514. It was then decided to send a Portuguese embassy to Abyssinia. The first ambassador died, and his successor, Dom Rodrigo de Lima, and his party left from India in 1517 and finally reached the emperor's camp in December 1520. They found Pêro old but robust, and he served them as guide and interpreter. When they returned in 1524, Pêro and his wife and family accompanied them for part of the way, and he sent his 23-year-old son with Dom Rodrigo to be educated in Portugal.