João de Castro
João de Castro
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João de Castro

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João de Castro

Dom João de Castro (27 February 1500 – 6 June 1548) was a Portuguese nobleman, scientist, writer and colonial administrator, who served as the fourth Portuguese Viceroy of India from 1545 to 1548. He was called Strong Castro (Portuguese: Castro Forte) by the poet Luís de Camões. De Castro was the second son of Álvaro de Castro, the civil governor of Lisbon. His wife was Leonor Coutinho.

As the younger son of Álvaro de Castro, João was destined for the church. He studied mathematics under Pedro Nunes, along with Luis, Duke of Beja, son of King Manuel I of Portugal, with whom he formed a lifelong friendship. At eighteen, he went to Tangier for several years, where he was knighted by Dom Duarte de Menezes, the governor.

In 1535 de Castro accompanied Dom Luís to the siege of Tunis, where he refused knighthood and rewards from Emperor Charles V. When de Castro returned to Lisbon, the king awarded him the commendation of São Paulo de Salvaterra in the Order of Christ in 1538.

Soon after, de Castro left for India with his uncle Garcia de Noronha, and participated in the relief of Diu upon his arrival at Goa. In 1540 he served on an expedition to Suez under Estêvão da Gama (the son of Vasco da Gama and then viceroy of India), who knighted his son, Álvaro de Castro in recognition of D. João. After Noronha's death, da Gama succeeded him, and de Castro joined da Gama on an expedition to the Red Sea. Da Gama departed on 31 December 1540, with 12 large galleons (one of which was captained by de Castro) and carracks, and 60 galleys.

De Castro kept a detailed journal of the voyage with maps, calculations, pictures, and detailed notes of the coasts of the Arabian Peninsula and regions that are known as Somalia, Eritrea, Ethiopia, Sudan, and Egypt today. He traveled to Suez and other ports on the shores of the Sinai Peninsula, all included in the Roteiro do Mar Roxo.

Unlike other viceroys, Castro was interested in Indian culture and religion. He collaborated with the humanist André de Resende to write a book on Indian art. His estate of Penha Verde, in Sintra, contains the two famous black stones of Cambay, retrieved by de Castro and his son.

Returning to Portugal, de Castro was named commander of a fleet in 1543 to clear Atlantic Europe of pirates. In 1545 he was sent to India with six ships to replace governor Martim Afonso de Sousa. Seconded by his sons (one of whom, Fernão, was killed) and by João Mascarenhas, de Castro overthrew Mahmud, King of Gujarat, and defeated the army of the Adil Khan. He also captured Bharuch, subjugated Malacca, and traveled in António Moniz's passage into Ceylon. In 1547, he was appointed to be viceroy by King João III of Portugal due to his victory at the second siege of Diu.

After the victory of his Armada in the relief of Diu, he asked the king to not prolong his term of office beyond the ordinary three years and to allow him to return to the Sintra Mountains in Portugal. After his victory over Mahmud and the Adil Khan, de Castro rebuilt Diu with the money received from the citizens of Goa. He did not live long enough to fulfill this goal, and died in the arms of his friend, Saint Francis Xavier, on 6 June 1548.

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