poem, Os Lusíadas, was written in his honour by Luís de Camões. Early life Vasco da Gama was born in 1460 in the town of Sines, one of the few seaports on the Alentejo coast, southwest Portugal, probably in a house near the church of Nossa Senhora das Salas. Vasco da Gama's father was Estêvão da Gama, who had served in the 1460s as a knight of the household of Infante Ferdinand, Duke of Viseu. He rose in the ranks of the military Order of Santiago. Estêvão da Gama was appointed alcaide-mór (civil governor) of Sines in the 1460s, a post he held until 1478; after that he continued as a receiver of taxes and holder of the Order's commendas in the region. Estêvão da Gama married Isabel Sodré, a daughter of João Sodré (also known as João de Resende), scion of a well-connected family of English origin. Her father and her brothers, Vicente Sodré and Brás Sodré, had links to the household of Infante Diogo, Duke of Viseu, and were prominent figures in the military Order of Christ. Vasco da Gama was the third of five sons of Estêvão da Gama and Isabel Sodré – in (probable) order of age: Paulo da Gama, João Sodré, Vasco da Gama, Pedro da Gama and Aires da Gama. Vasco also had one known sister, Teresa da Gama (who married Lopo Mendes de Vasconcelos). Little is known of da Gama's early life. The Portuguese historian Teixeira de Aragão suggests that he studied at the inland town of Évora, which is where he may have learned mathematics and navigation. It has been claimed that he studied under Abraham Zacuto, an astrologer and astronomer, but da Gama's biographer Subrahmanyam thinks this dubious. Around 1480, da Gama followed his father (rather than the Sodrés) and joined the Order of Santiago. The master of Santiago was Prince John, who ascended to the throne in 1481 as King John II of Portugal. John II doted on the Order, and the da Gamas' prospects rose accordingly. In 1492, John II dispatched da Gama on a mission to the port of Setúbal and to the Algarve to seize French ships in retaliation for peacetime depredations against Portuguese shipping – a task that da Gama rapidly and effectively performed. Exploration before da Gama From the earlier part of the 15th century, Portuguese expeditions organized by Prince Henry the Navigator had been