The Military Order of Christ (Portuguese: Ordem Militar de Nosso Senhor Jesus Cristo), before 1910 Royal Military Order of Our Lord Jesus Christ (Portuguese: Real Ordem Militar de Nosso Senhor Jesus Cristo), previously the Order of the Knights of Our Lord Jesus Christ (Ordem dos Cavaleiros de Nosso Senhor Jesus Cristo), is the former Knights Templar order as it was reconstituted in Portugal after the Templars were abolished on 22 March 1312 by the papal bull, Vox in excelso, issued by Pope Clement V. The Order of Christ was founded in 1319, with the protection of the Portuguese king, Denis, who refused to pursue and persecute the former knights as had occurred in most of the other sovereign states under the political influence of the Catholic Church.

Heavily swayed by Philip IV of France, Pope Clement had the Knights Templar annihilated throughout France and most of Europe on charges of heresy, but Denis revived the Templars of Tomar as the Order of Christ, largely for their aid during the Reconquista and in the reconstruction of Portugal after the wars. Denis negotiated with Clement's successor, John XXII, for recognition of the new order and its right to inherit the Templar assets and property. This was granted in a papal bull, Ad ea ex quibus, on 14 March 1319.There exists also a parallel Supreme Order of Christ of the Holy See and Order of Christ of House of Orlans-Braganza.

Dom Henrique of Portugal, Duke of Viseu (4 March 1394 – 13 November 1460), better known as Prince Henry the Navigator (Portuguese: Infante Dom Henrique, o Navegador), was a central figure in the early days of the Portuguese Empire and in the 15th-century European maritime discoveries and maritime expansion. Through his administrative direction, he is regarded as the main initiator of what would be known as the Age of Discovery. Henry was the fourth child of the Portuguese King John I, who founded the House of Aviz.After procuring the new caravel ship, Henry was responsible for the early development of Portuguese exploration and maritime trade with other continents through the systematic exploration of Western Africa, the islands of the Atlantic Ocean, and the search for new routes. He encouraged his father to conquer Ceuta (1415), the Muslim port on the North African coast across the Straits of Gibraltar from the Iberian Peninsula. He learned of the opportunities offered by the Saharan trade routes that terminated there, and became fascinated with Africa in general; he was most intrigued by the Christian legend of Prester John and the expansion of Portuguese trade. He is regarded as the patron of Portuguese exploration.