He was the son of Dom James, 4th Duke of Braganza from his second marriage to Joana of Mendoça, daughter of Diogo of Mendonça, High-Alcaide of Mourão.
When he was 19 years old, he was appointed by King Dom John III of Portugal as his special ambassador to the baptism ceremony of King Henry II of France's son.
In 1558, he was appointed by the regent Dona Catherine of Habsburg (King Dom John III's widow) as the 20th Governor of Portuguese India, using also the title of 7th Viceroy. He left Lisbon on 7 April 1558 and arrived in Goa on 3 September.
He was a remarkable organiser of the local State, and he conquered Daman, Ceylon (nowadays known as Sri Lanka) and the island of Manar.
A first expedition, led by Viceroy Dom Constantino de Bragança in 1560, failed to subdue Jaffna, but captured Mannar Island.[1] By June 1619, despite sharp resistance from Cankili II of Jaffna, there were two Portuguese expeditions; a naval expedition that was repulsed by the Malabari corsairs and another expedition by Dom Filipe de Oliveira and his land army of 5,000, which defeated Cankili and conquered Jaffna, strengthening Portuguese control of shipping routes through the Palk Strait.[2]
His government in India took three years and eight days, and during that period he made important reforms. He was considered by the historian C. R. Boxer one of the most fanatic Portuguese governors of India together with Dom Francisco Barreto (1555–1558).
Dom Constantino afterwards returned to the Kingdom. There he married his cousin, D. Maria de Melo, daughter of the 1st Marquess of Ferreira and 1st Count of Tentúgal, D. Rodrigo de Melo, and Dona Brites de Menezes (daughter of Dom Antão de Almada, 3rd Count of Avranches). The couple had no issue. King Sebastian of Portugal thought, in 1571, to appoint him as perpetual viceroy of India, but he refused.
Tooth relic
According to Mutu Coomara Swamy, Constantino claimed to play a part in capturing and destroying the Tooth-Relic of Gotama Buddha, during the wars of the Portuguese. The native authorities however, maintained the relic was kept safe from harm.[3]
"Constantino de Bragança" in Christian-Muslim Relations. A Bibliographical History, vol. 7, eds. David Thomas and John Chesworth, Leiden - Boston, Brill, 2015, pp. 841–845. [1]
Note: The head of Portuguese India could have either the title of "Governor" or the more prestigious "Viceroy" though their responsibilities were the same
Generations indicate descent from Afonso, Duke of Braganza, founder of the House of Braganza, until João II, Duke of Braganza, the first Braganza monarch of Portugal; italics indicate a head of the House
Generations indicate descent from John IV, King of Portugal, formerly John II, Duke of Braganza, the first Braganza monarch of Portugal, until Manuel II, King of Portugal, the last monarch of Portugal, excluding the Miguelist line; italics indicate a head of the House