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David was one of three sons of Portuguese "New Christians" who had escaped from Bragança, and settled, under the Catholic names Cristóvão Luís and Isabel da Paz in the French town of Tartas.
He abolished slavery in Portugal and the Portuguese colonies in India, reorganized the army and the navy, abolished the Autos-de-fé and ended the Limpeza de Sangue (cleanliness of blood) civil statutes and their discrimination against New Christians, the Jews that had converted to Christianity, and their descendents regardless of genealogical distance, in order to escape the Portuguese Inquisition.
Drescher, Seymour, (JANCAST) "Jews and New Christians in the Atlantic Slave Trade" in The Jews and the Expansion of Europe to the West, 1400-1800, Paolo Bernardini (Ed.), 2004, p 439-484.