Foreign nations were trying to take over....
Because the Byzantine empire was weakened from other areas which the Barbarians invaded from hope I helped
Answer:
In 1488, Portuguese explorer Bartolomeu Dias (c. 1450-1500) became the first European mariner to round the southern tip of Africa, opening the way for a sea route from Europe to Asia. Dias’ ships rounded the perilous Cape of Good Hope and then sailed around Africa’s southernmost point, Cabo das Agulhas, to enter the waters of the Indian Ocean. Portugal and other European nations already had long-established trade ties to Asia, but the arduous overland route had been closed in the 1450s due to the Ottoman Empire’s conquest of the remnants of the Byzantine Empire. A major maritime victory for Portugal, Dias’ breakthrough opened the door to increased trade with India and other Asian powers. It also prompted Genoan explorer Christopher Columbus (1451-1506), then living in Portugal, to seek a new royal patron for a mission to establish his own sea route to the Far East.
An Ambitious Plan
Almost nothing is known about the life of Bartolomeu de Novaes Dias before 1487, except that he was at the court of João II, or King John II of Portugal (1455-1495), and was a superintendent of the royal warehouses. He likely had much more sailing experience than his one recorded stint aboard the warship São Cristóvão. Dias was probably in his mid- to late-30s in 1486 when King João II appointed him to head an expedition in search of a sea route to India.
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